diff --git a/frontend-web/src/roundtable-planning/components/Step3SummaryMode.tsx b/frontend-web/src/roundtable-planning/components/Step3SummaryMode.tsx
index 349f0045..739eae69 100644
--- a/frontend-web/src/roundtable-planning/components/Step3SummaryMode.tsx
+++ b/frontend-web/src/roundtable-planning/components/Step3SummaryMode.tsx
@@ -21,6 +21,8 @@ import {
   Loader2,
   PanelLeftClose,
   PanelLeftOpen,
+  Paperclip,
+  Pause,
   RefreshCw,
   SendHorizontal,
   Sparkles,
@@ -113,11 +115,12 @@ export function Step3SummaryMode({
     dialogues,
     seatStubMessages,
     activeArtifactThreadId,
-    canAsk,
+    busy,
     start,
     hydrateSaved,
     redraw,
     ask,
+    pause,
     abort,
     openArtifactFromStep,
     openArtifactPreview,
@@ -303,9 +306,10 @@ export function Step3SummaryMode({
               phase={phase}
               dialogues={dialogues}
               error={error}
-              canAsk={canAsk}
+              busy={busy}
               onRetry={redraw}
               onAsk={ask}
+              onPause={pause}
               onArtifactStepClick={openArtifactFromStep}
               onArtifactPreview={openArtifactPreview}
               selectedModel={selectedModel}
@@ -422,9 +426,10 @@ function AgentProgressPanel({
   phase,
   dialogues,
   error,
-  canAsk,
+  busy,
   onRetry,
   onAsk,
+  onPause,
   onArtifactStepClick,
   onArtifactPreview,
   selectedModel,
@@ -435,9 +440,10 @@ function AgentProgressPanel({
   phase: ReturnType<typeof useStep3Summary>["phase"];
   dialogues: ReturnType<typeof useStep3Summary>["dialogues"];
   error: string | null;
-  canAsk: boolean;
+  busy: boolean;
   onRetry: () => void;
-  onAsk: (message: string) => void;
+  onAsk: (message: string, files?: File[]) => void;
+  onPause: () => void;
   onArtifactStepClick: ReturnType<typeof useStep3Summary>["openArtifactFromStep"];
   onArtifactPreview: ReturnType<typeof useStep3Summary>["openArtifactPreview"];
   selectedModel: string;
@@ -445,17 +451,33 @@ function AgentProgressPanel({
   modelsLoading: boolean;
   setSelectedModel: (model: string) => void;
 }) {
-  const busy = phase === "creating" || phase === "streaming";
   const scrollRef = useRef<HTMLDivElement>(null);
   const { atBottom, scrollToBottom } = useAutoScroll(scrollRef, [dialogues]);
   const [askText, setAskText] = useState("");
+  // 输入框携带的本地附件（点发送时连同指令一起上传到总结线程）。
+  const [askFiles, setAskFiles] = useState<File[]>([]);
+  const fileInputRef = useRef<HTMLInputElement>(null);
+
+  const pickFiles = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const picked = Array.from(e.target.files ?? []);
+    if (picked.length > 0) {
+      setAskFiles((prev) => {
+        const seen = new Set(prev.map((f) => `${f.name}:${f.size}`));
+        return [...prev, ...picked.filter((f) => !seen.has(`${f.name}:${f.size}`))];
+      });
+    }
+    e.target.value = "";
+  };
+  const removeFile = (idx: number) => setAskFiles((prev) => prev.filter((_, i) => i !== idx));
 
   const handleAskSubmit = (e: FormEvent<HTMLFormElement>) => {
     e.preventDefault();
     const text = askText.trim();
-    if (!text || !canAsk) return;
+    const hasFiles = askFiles.length > 0;
+    if (!text && !hasFiles) return; // 允许「随时」发送（含生成中）；空内容不发
     setAskText("");
-    onAsk(text);
+    setAskFiles([]);
+    onAsk(text, hasFiles ? askFiles : undefined);
   };
 
   return (
@@ -551,6 +573,31 @@ function AgentProgressPanel({
         </div>
         {!atBottom && <ScrollToBottomButton onClick={scrollToBottom} />}
         <form onSubmit={handleAskSubmit} className="shrink-0 border-t border-slate-100 bg-white px-3 py-3">
+          {/* 已选附件预览（发送时随指令上传到总结线程，供智能体读取） */}
+          {askFiles.length > 0 && (
+            <div className="mb-2 flex flex-wrap gap-1.5">
+              {askFiles.map((file, idx) => (
+                <span
+                  key={`${file.name}-${file.size}-${idx}`}
+                  className="inline-flex items-center gap-1.5 bg-white border border-slate-200 rounded-lg pl-2 pr-1 py-1 text-[11px] text-slate-600 max-w-[200px]"
+                >
+                  <FileText className="w-3 h-3 shrink-0 text-primary" />
+                  <span className="truncate font-medium" title={file.name}>
+                    {file.name}
+                  </span>
+                  <span className="shrink-0 text-slate-400">{formatBytes(file.size)}</span>
+                  <button
+                    type="button"
+                    onClick={() => removeFile(idx)}
+                    className="shrink-0 p-0.5 rounded hover:bg-slate-200 text-slate-400 hover:text-slate-600 transition"
+                    title="移除"
+                  >
+                    <X className="w-3 h-3" />
+                  </button>
+                </span>
+              ))}
+            </div>
+          )}
           <div className="flex items-end gap-2 rounded-2xl border border-slate-200 bg-slate-50/70 px-3 py-2 focus-within:border-primary/60 focus-within:bg-white focus-within:ring-2 focus-within:ring-[var(--brand-200)]/40">
             <textarea
               value={askText}
@@ -561,22 +608,46 @@ function AgentProgressPanel({
                   e.currentTarget.form?.requestSubmit();
                 }
               }}
-              disabled={!canAsk}
               rows={1}
-              placeholder="继续对话：提修改意见（如「执行路线写细些」）或就报告提问"
-              className="min-h-8 max-h-28 flex-1 resize-none bg-transparent py-1.5 text-xs leading-relaxed text-slate-800 placeholder:text-slate-400 focus:outline-none disabled:cursor-not-allowed disabled:opacity-60"
+              placeholder={
+                busy
+                  ? "生成中也可随时插话干预：发送将打断当前轮并据此继续…"
+                  : "继续对话：提修改意见（如「执行路线写细些」）/ 提问 / 上传参考文件"
+              }
+              className="min-h-8 max-h-28 flex-1 resize-none bg-transparent py-1.5 text-xs leading-relaxed text-slate-800 placeholder:text-slate-400 focus:outline-none"
             />
+
+            {/* 上传文件（参考第一/二步：本地选取，发送时上传到总结线程） */}
+            <input ref={fileInputRef} type="file" multiple className="hidden" onChange={pickFiles} />
+            <button
+              type="button"
+              onClick={() => fileInputRef.current?.click()}
+              title="上传参考文件（智能体将读取文件内容辅助总结/修改）"
+              className="mb-0.5 flex h-8 w-8 shrink-0 items-center justify-center rounded-xl bg-white border border-slate-200 text-slate-500 hover:text-primary hover:bg-slate-50 transition active:scale-95"
+            >
+              <Paperclip className="h-4 w-4" />
+            </button>
+
+            {/* 暂停（仅生成中显示） */}
+            {busy && (
+              <button
+                type="button"
+                onClick={onPause}
+                title="暂停当前生成"
+                className="mb-0.5 flex h-8 w-8 shrink-0 items-center justify-center rounded-xl bg-amber-100 border border-amber-200/60 text-amber-700 hover:bg-amber-200 transition active:scale-95"
+              >
+                <Pause className="h-4 w-4" />
+              </button>
+            )}
+
+            {/* 发送（随时可发：生成中发送=打断并续问） */}
             <button
               type="submit"
-              disabled={!canAsk || askText.trim().length === 0}
-              title={busy ? "正在撰写，请稍后发送" : "发送（智能体自行判断改报告 or 回答）"}
+              disabled={askText.trim().length === 0 && askFiles.length === 0}
+              title={busy ? "打断当前轮并发送" : "发送（智能体自行判断改报告 or 回答）"}
               className="mb-0.5 flex h-8 w-8 shrink-0 items-center justify-center rounded-xl bg-primary text-white transition hover:bg-[var(--brand-900)] disabled:cursor-not-allowed disabled:opacity-50"
             >
-              {busy ? (
-                <Loader2 className="h-4 w-4 animate-spin" />
-              ) : (
-                <SendHorizontal className="h-4 w-4" />
-              )}
+              <SendHorizontal className="h-4 w-4" />
             </button>
           </div>
         </form>
diff --git a/frontend-web/src/roundtable-planning/hooks/useStep3Summary.ts b/frontend-web/src/roundtable-planning/hooks/useStep3Summary.ts
index 272489c4..30e19df9 100644
--- a/frontend-web/src/roundtable-planning/hooks/useStep3Summary.ts
+++ b/frontend-web/src/roundtable-planning/hooks/useStep3Summary.ts
@@ -17,6 +17,7 @@ import { useCallback, useEffect, useRef, useState } from "react";
 
 import { useArtifacts } from "@/components/workspace/artifacts";
 import { apiFetch } from "@/core/api";
+import { uploadFiles } from "@/core/uploads/api";
 import type {
   DraftStep3SummarySnapshot,
 } from "@/roundtable-planning/api/drafts";
@@ -25,8 +26,12 @@ import {
   initSummaryThread,
   listSessionArtifacts,
   streamMultiAgent,
+  type StreamMultiAgentRequest,
   type StreamPhase,
 } from "@/roundtable-planning/api/multi-agent";
+
+/** 一个上传文件的 run 引用（与 streamMultiAgent 的 files 入参对齐）。 */
+type RunFileRef = NonNullable<StreamMultiAgentRequest["files"]>[number];
 import type {
   ReportIntent,
   ReportSeatDelivery,
@@ -64,16 +69,21 @@ export interface UseStep3SummaryReturn {
   dialogues: Step2Dialogue[];
   seatStubMessages: Record<string, StubAiMessage[]>;
   activeArtifactThreadId: string | null;
-  /** 是否可发送追问/修改（非流式中、且已有线程或可新建）。 */
-  canAsk: boolean;
+  /** 是否正在生成中（撰写/初始化/上传）—— 驱动暂停按钮与发送态。 */
+  busy: boolean;
   /** 启动总结（幂等：进行中重复调用会被忽略）。 */
   start: () => void;
   /** 从草稿快照恢复展示（不重新生成；保留 threadId 以便继续问答）。 */
   hydrateSaved: (snapshot: DraftStep3SummarySnapshot) => void;
   /** 重新生成（先中断在途请求再重跑）。 */
   redraw: () => void;
-  /** 用户在输入框里继续对话：续同一线程，智能体自判改报告 or 问答。 */
-  ask: (message: string) => void;
+  /**
+   * 用户在输入框里继续对话 —— **随时可发**：生成中发送会先打断当前轮再续同一线程，
+   * 智能体自判改报告 or 问答；可携带上传文件（先传到总结线程再随消息注入）。
+   */
+  ask: (message: string, files?: File[]) => void;
+  /** 暂停当前生成（中断在途请求并把当前气泡收尾为「已暂停」）。 */
+  pause: () => void;
   /** 中断在途请求（卸载 / 切回普通视图时调用）。 */
   abort: () => void;
   openArtifactFromStep: (
@@ -622,6 +632,13 @@ export function useStep3Summary(
     runningRef.current = false;
   }, []);
 
+  /** 把仍在流式的气泡冻结（停转圈），并打上状态标签（打断 / 暂停时用）。 */
+  const freezeStreaming = useCallback((note: string) => {
+    setDialogues((prev) =>
+      prev.map((d) => (d.streaming ? { ...d, streaming: false, confidence: note } : d)),
+    );
+  }, []);
+
   /** 把当前报告 md 种进某线程 stub + 开沙箱（续问时给 reconcile/预览一个锚点）。 */
   const seedStubWithCurrentMd = useCallback(
     (threadId: string) => {
@@ -648,8 +665,9 @@ export function useStep3Summary(
       aborter: AbortController;
       seedThreadId?: string | null;
       forceReconcile?: boolean;
+      files?: RunFileRef[];
     }): Promise<void> => {
-      const { bubbleId, prompt, aborter, seedThreadId, forceReconcile } = args;
+      const { bubbleId, prompt, aborter, seedThreadId, forceReconcile, files } = args;
 
       let threadId = seedThreadId ?? null;
       let agentName = SUMMARY_AGENT_NAME;
@@ -676,6 +694,7 @@ export function useStep3Summary(
         displayName: "方案总结报告",
         newMessage: prompt,
         model: selectedModel || undefined,
+        files: files && files.length > 0 ? files : undefined,
         signal: aborter.signal,
         onTextDelta: (text) => appendToDialogue(bubbleId, text),
         onPhaseChange: (p, toolName, pArgs) => {
@@ -763,7 +782,8 @@ export function useStep3Summary(
       finalizeDialogue(bubbleId, `(总结失败) ${msg}`, "总结失败");
       setPhase("error");
     } finally {
-      runningRef.current = false;
+      // 只有「本轮仍是当前轮」才复位 running —— 被新一轮（干预/重新生成）抢占时不要误清。
+      if (aborterRef.current === aborter) runningRef.current = false;
     }
   }, [
     intentReady,
@@ -776,53 +796,99 @@ export function useStep3Summary(
   ]);
 
   const ask = useCallback(
-    async (message: string) => {
+    async (message: string, files?: File[]) => {
       const text = message.trim();
-      if (!text || runningRef.current) return;
+      const hasFiles = !!(files && files.length > 0);
+      if (!text && !hasFiles) return;
+
+      // 「随时干预」：生成中也能发——先打断当前轮（后端 multitask=rollback 抢占旧 run），
+      // 并把当前流式气泡冻结成「已打断」，再续上同一线程跑新一轮。
+      const wasBusy = runningRef.current;
+      abort();
+      if (wasBusy) freezeStreaming("已打断");
+
       runningRef.current = true;
       setError(null);
-
       const aborter = new AbortController();
       aborterRef.current = aborter;
-
-      appendUserDialogue(text);
-      const bubbleId = appendStreamingDialogue({
-        sender: "方案总结报告智能体",
-        avatarType: "blue",
-      });
-      setPhase("streaming");
+      // 续问前是否已有真线程：决定 prompt 形态——有则发原始消息（上下文在线程里），
+      // 没有（恢复后 / 首轮还没建好就被打断）则用带研讨原料 + 旧报告的完整 prompt。
+      const hadLiveThread = !!liveThreadRef.current;
 
       try {
-        const live = liveThreadRef.current;
-        if (live) {
+        // 有附件：先确保有线程（首轮还没建好则新建），再把文件上传到该线程。
+        let threadId = liveThreadRef.current;
+        if (hasFiles && !threadId) {
+          setPhase("creating");
+          const init = await initSummaryThread({ signal: aborter.signal });
+          if (aborter.signal.aborted) return;
+          threadId = init.threadId;
+          liveThreadRef.current = threadId;
+          setSummaryThreadId(threadId);
+          setActiveArtifactThreadId(threadId);
+        }
+        let fileRefs: RunFileRef[] | undefined;
+        if (hasFiles && threadId) {
+          setPhase("creating");
+          const up = await uploadFiles(threadId, files!);
+          if (aborter.signal.aborted) return;
+          fileRefs = up.files.map((f) => ({
+            filename: f.filename,
+            size: f.size,
+            path: f.virtual_path,
+            status: "uploaded" as const,
+          }));
+        }
+
+        const fileNote = hasFiles ? `（附 ${files!.length} 个文件）` : "";
+        appendUserDialogue((text || "(上传了参考文件)") + fileNote);
+        const bubbleId = appendStreamingDialogue({
+          sender: "方案总结报告智能体",
+          avatarType: "blue",
+        });
+        setPhase("streaming");
+
+        if (hadLiveThread) {
           // 真线程仍在 → 续问，发原始消息，靠线程上下文 + SOUL 自判改/答。
+          const prompt =
+            text || "我上传了参考文件，请先阅读文件内容，再据此更新报告或回答。";
           await streamOnce({
             bubbleId,
-            prompt: text,
+            prompt,
             aborter,
-            seedThreadId: live,
+            seedThreadId: liveThreadRef.current,
             forceReconcile: true,
+            files: fileRefs,
           });
         } else {
-          // 恢复草稿后无 live thread → 新建线程，prompt 带上旧报告做底。
+          // 无 live thread（恢复草稿 / 首轮没建好就被打断）→ prompt 带研讨原料 + 旧报告做底。
+          // 若上面为上传文件已建好线程（threadId）就复用它，否则交给 streamOnce 新建。
           const prompt = buildResumeAskPrompt({
             intentReady,
             seatDeliveries,
             consensusText,
             coordinatorPrompt,
             previousMd: currentMdRef.current,
-            userMessage: text,
+            userMessage:
+              text || "请阅读我上传的参考文件后，据此更新报告或回答。",
+          });
+          await streamOnce({
+            bubbleId,
+            prompt,
+            aborter,
+            seedThreadId: threadId,
+            forceReconcile: true,
+            files: fileRefs,
           });
-          await streamOnce({ bubbleId, prompt, aborter, forceReconcile: true });
         }
       } catch (err) {
         if (aborter.signal.aborted) return;
         const msg = err instanceof Error ? err.message : String(err);
         setError(msg);
-        finalizeDialogue(bubbleId, `(处理失败) ${msg}`, "处理失败");
+        freezeStreaming("处理失败");
         setPhase("error");
       } finally {
-        runningRef.current = false;
+        if (aborterRef.current === aborter) runningRef.current = false;
       }
     },
     [
@@ -830,13 +896,22 @@ export function useStep3Summary(
       seatDeliveries,
       consensusText,
       coordinatorPrompt,
+      abort,
+      freezeStreaming,
       appendUserDialogue,
       appendStreamingDialogue,
-      finalizeDialogue,
       streamOnce,
     ],
   );
 
+  /** 暂停当前生成：中断在途请求 + 把流式气泡收尾为「已暂停」+ 状态回 done。 */
+  const pause = useCallback(() => {
+    if (!runningRef.current) return;
+    abort();
+    freezeStreaming("已暂停");
+    setPhase((p) => (p === "creating" || p === "streaming" ? "done" : p));
+  }, [abort, freezeStreaming]);
+
   const start = useCallback(() => {
     void run();
   }, [run]);
@@ -912,7 +987,6 @@ export function useStep3Summary(
   );
 
   const busy = phase === "creating" || phase === "streaming";
-  const canAsk = !busy && (phase === "done" || phase === "error");
 
   return {
     phase,
@@ -921,11 +995,12 @@ export function useStep3Summary(
     dialogues,
     seatStubMessages,
     activeArtifactThreadId,
-    canAsk,
+    busy,
     start,
     hydrateSaved,
     redraw,
     ask,
+    pause,
     abort,
     openArtifactFromStep,
     openArtifactPreview,