diff --git a/ui/src/components/IssueChatThread.test.tsx b/ui/src/components/IssueChatThread.test.tsx
index 51c4f5f2707..e9d8cab3a53 100644
--- a/ui/src/components/IssueChatThread.test.tsx
+++ b/ui/src/components/IssueChatThread.test.tsx
@@ -252,6 +252,21 @@ function createExpiredRequestConfirmationInteraction(
   };
 }
 
+function createFileDragEvent(type: string, files: File[]) {
+  const event = new Event(type, { bubbles: true, cancelable: true }) as Event & {
+    dataTransfer: {
+      types: string[];
+      files: File[];
+      dropEffect?: string;
+    };
+  };
+  event.dataTransfer = {
+    types: ["Files"],
+    files,
+  };
+  return event;
+}
+
 describe("IssueChatThread", () => {
   let container: HTMLDivElement;
 
@@ -828,6 +843,103 @@ describe("IssueChatThread", () => {
     });
   });
 
+  it("shows full-composer drop instructions while dragging files over the issue composer", () => {
+    const root = createRoot(container);
+
+    act(() => {
+      root.render(
+        <MemoryRouter>
+          <IssueChatThread
+            comments={[]}
+            linkedRuns={[]}
+            timelineEvents={[]}
+            liveRuns={[]}
+            onAdd={async () => {}}
+            imageUploadHandler={async () => "/api/attachments/image/content"}
+            onAttachImage={async () => undefined}
+            enableLiveTranscriptPolling={false}
+          />
+        </MemoryRouter>,
+      );
+    });
+
+    const composer = container.querySelector('[data-testid="issue-chat-composer"]') as HTMLDivElement | null;
+    expect(composer).not.toBeNull();
+    const fileInput = container.querySelector('input[type="file"]') as HTMLInputElement | null;
+    expect(fileInput?.getAttribute("accept")).toBeNull();
+
+    act(() => {
+      composer?.dispatchEvent(createFileDragEvent("dragenter", [
+        new File(["hello"], "notes.txt", { type: "text/plain" }),
+      ]));
+    });
+
+    expect(container.querySelector('[data-testid="issue-chat-composer-drop-overlay"]')).not.toBeNull();
+    expect(container.textContent).toContain("Drop files to attach");
+    expect(container.textContent).toContain("Images insert into the reply");
+    expect(container.textContent).toContain("Other files are added to this issue");
+    expect(composer?.className).toContain("border-primary/45");
+
+    act(() => {
+      root.unmount();
+    });
+  });
+
+  it("shows non-image attachment upload state in the composer after a drop", async () => {
+    const root = createRoot(container);
+    const onAttachImage = vi.fn(async (file: File) => ({
+      id: "attachment-1",
+      companyId: "company-1",
+      issueId: "issue-1",
+      issueCommentId: null,
+      assetId: "asset-1",
+      provider: "local_disk",
+      objectKey: "issues/issue-1/report.pdf",
+      contentPath: "/api/attachments/attachment-1/content",
+      originalFilename: file.name,
+      contentType: file.type,
+      byteSize: file.size,
+      sha256: "abc123",
+      createdByAgentId: null,
+      createdByUserId: "user-1",
+      createdAt: new Date("2026-04-24T12:00:00.000Z"),
+      updatedAt: new Date("2026-04-24T12:00:00.000Z"),
+    }));
+
+    await act(async () => {
+      root.render(
+        <MemoryRouter>
+          <IssueChatThread
+            comments={[]}
+            linkedRuns={[]}
+            timelineEvents={[]}
+            liveRuns={[]}
+            onAdd={async () => {}}
+            onAttachImage={onAttachImage}
+            enableLiveTranscriptPolling={false}
+          />
+        </MemoryRouter>,
+      );
+    });
+
+    const composer = container.querySelector('[data-testid="issue-chat-composer"]') as HTMLDivElement | null;
+    const file = new File(["report body"], "report.pdf", { type: "application/pdf" });
+
+    await act(async () => {
+      composer?.dispatchEvent(createFileDragEvent("drop", [file]));
+    });
+
+    expect(onAttachImage).toHaveBeenCalledWith(file);
+    const attachmentList = container.querySelector('[data-testid="issue-chat-composer-attachments"]');
+    expect(attachmentList).not.toBeNull();
+    expect(container.textContent).toContain("report.pdf");
+    expect(container.textContent).toContain("Attached to issue");
+
+    await act(async () => {
+      root.unmount();
+    });
+  });
+
   it("renders the bottom spacer with zero height until the user has submitted", () => {
     const root = createRoot(container);
 
diff --git a/ui/src/components/IssueChatThread.tsx b/ui/src/components/IssueChatThread.tsx
index d6e930efe61..ac461fc0ac2 100644
--- a/ui/src/components/IssueChatThread.tsx
+++ b/ui/src/components/IssueChatThread.tsx
@@ -31,6 +31,7 @@ import type {
   FeedbackDataSharingPreference,
   FeedbackVote,
   FeedbackVoteValue,
+  IssueAttachment,
   IssueRelationIssueSummary,
 } from "@paperclipai/shared";
 import type { ActiveRunForIssue, LiveRunForIssue } from "../api/heartbeats";
@@ -219,7 +220,7 @@ export interface IssueChatComposerHandle {
 
 interface IssueChatComposerProps {
   onImageUpload?: (file: File) => Promise<string>;
-  onAttachImage?: (file: File) => Promise<void>;
+  onAttachImage?: (file: File) => Promise<IssueAttachment | void>;
   draftKey?: string;
   enableReassign?: boolean;
   reassignOptions?: InlineEntityOption[];
@@ -259,7 +260,7 @@ interface IssueChatThreadProps {
   onCancelRun?: () => Promise<void>;
   onStopRun?: (runId: string) => Promise<void>;
   imageUploadHandler?: (file: File) => Promise<string>;
-  onAttachImage?: (file: File) => Promise<void>;
+  onAttachImage?: (file: File) => Promise<IssueAttachment | void>;
   draftKey?: string;
   enableReassign?: boolean;
   reassignOptions?: InlineEntityOption[];
@@ -508,10 +509,27 @@ const DRAFT_DEBOUNCE_MS = 800;
 const COMPOSER_FOCUS_SCROLL_PADDING_PX = 96;
 const SUBMIT_SCROLL_RESERVE_VH = 0.4;
 
+type ComposerAttachmentItem = {
+  id: string;
+  name: string;
+  size: number;
+  status: "uploading" | "attached" | "error";
+  inline: boolean;
+  contentPath?: string;
+  error?: string;
+};
+
 function hasFilePayload(evt: ReactDragEvent<HTMLDivElement>) {
   return Array.from(evt.dataTransfer?.types ?? []).includes("Files");
 }
 
+function formatAttachmentSize(bytes: number) {
+  if (!Number.isFinite(bytes) || bytes <= 0) return "";
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
+  return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
+}
+
 function toIsoString(value: string | Date | null | undefined): string | null {
   if (!value) return null;
   return typeof value === "string" ? value : value.toISOString();
@@ -2055,6 +2073,7 @@ const IssueChatComposer = forwardRef<IssueChatComposerHandle, IssueChatComposerP
   const [submitting, setSubmitting] = useState(false);
   const [attaching, setAttaching] = useState(false);
   const [isDragOver, setIsDragOver] = useState(false);
+  const [composerAttachments, setComposerAttachments] = useState<ComposerAttachmentItem[]>([]);
   const dragDepthRef = useRef(0);
   const effectiveSuggestedAssigneeValue = suggestedAssigneeValue ?? currentAssigneeValue;
   const [reassignTarget, setReassignTarget] = useState(effectiveSuggestedAssigneeValue);
@@ -2148,6 +2167,7 @@ const IssueChatComposer = forwardRef<IssueChatComposerHandle, IssueChatComposerP
       queueViewportRestore(viewportSnapshot);
       await appendPromise;
       if (draftKey) clearDraft(draftKey);
+      setComposerAttachments([]);
       setReassignTarget(effectiveSuggestedAssigneeValue);
     } catch {
       setBody((current) =>
@@ -2163,13 +2183,59 @@ const IssueChatComposer = forwardRef<IssueChatComposerHandle, IssueChatComposerP
   }
 
   async function attachFile(file: File) {
-    if (onImageUpload && file.type.startsWith("image/")) {
-      const url = await onImageUpload(file);
-      const safeName = file.name.replace(/[[\]]/g, "\\$&");
-      const markdown = `![${safeName}](${url})`;
-      setBody((prev) => prev ? `${prev}\n\n${markdown}` : markdown);
-    } else if (onAttachImage) {
-      await onAttachImage(file);
+    const attachmentId = `${file.name}:${file.size}:${file.lastModified}:${Math.random().toString(36).slice(2)}`;
+    const inline = Boolean(onImageUpload && file.type.startsWith("image/"));
+    setComposerAttachments((prev) => [
+      ...prev,
+      {
+        id: attachmentId,
+        name: file.name,
+        size: file.size,
+        status: "uploading",
+        inline,
+      },
+    ]);
+
+    try {
+      if (onImageUpload && file.type.startsWith("image/")) {
+        const url = await onImageUpload(file);
+        const safeName = file.name.replace(/[[\]]/g, "\\$&");
+        const markdown = `![${safeName}](${url})`;
+        setBody((prev) => prev ? `${prev}\n\n${markdown}` : markdown);
+        setComposerAttachments((prev) => prev.map((item) =>
+          item.id === attachmentId
+            ? { ...item, status: "attached", contentPath: url }
+            : item,
+        ));
+      } else if (onAttachImage) {
+        const attachment = await onAttachImage(file);
+        setComposerAttachments((prev) => prev.map((item) =>
+          item.id === attachmentId
+            ? {
+                ...item,
+                status: "attached",
+                contentPath: attachment?.contentPath,
+                name: attachment?.originalFilename ?? item.name,
+              }
+            : item,
+        ));
+      } else {
+        setComposerAttachments((prev) => prev.map((item) =>
+          item.id === attachmentId
+            ? { ...item, status: "error", error: "This file type cannot be attached here" }
+            : item,
+        ));
+      }
+    } catch (err) {
+      setComposerAttachments((prev) => prev.map((item) =>
+        item.id === attachmentId
+          ? {
+              ...item,
+              status: "error",
+              error: err instanceof Error ? err.message : "Upload failed",
+            }
+          : item,
+      ));
     }
   }
 
@@ -2217,8 +2283,8 @@ const IssueChatComposer = forwardRef<IssueChatComposerHandle, IssueChatComposerP
       ref={composerContainerRef}
       data-testid="issue-chat-composer"
       className={cn(
-        "relative rounded-md border border-border/70 bg-background/95 p-[15px] shadow-[0_-12px_28px_rgba(15,23,42,0.08)] backdrop-blur supports-[backdrop-filter]:bg-background/85 dark:shadow-[0_-12px_28px_rgba(0,0,0,0.28)]",
-        isDragOver && "ring-2 ring-primary/60 bg-accent/10",
+        "relative rounded-md border border-border/70 bg-background/95 p-[15px] shadow-[0_-12px_28px_rgba(15,23,42,0.08)] backdrop-blur transition-[border-color,background-color,box-shadow] duration-150 supports-[backdrop-filter]:bg-background/85 dark:shadow-[0_-12px_28px_rgba(0,0,0,0.28)]",
+        isDragOver && "border-primary/45 bg-background shadow-[0_-12px_28px_rgba(15,23,42,0.08),0_0_0_1px_hsl(var(--primary)/0.18)]",
       )}
       onDragEnter={(evt) => {
         if (!canAcceptFiles || !hasFilePayload(evt)) return;
@@ -2246,6 +2312,25 @@ const IssueChatComposer = forwardRef<IssueChatComposerHandle, IssueChatComposerP
         void handleDroppedFiles(evt.dataTransfer?.files);
       }}
     >
+      {isDragOver && canAcceptFiles ? (
+        <div
+          data-testid="issue-chat-composer-drop-overlay"
+          className="pointer-events-none absolute inset-2 z-30 flex items-center justify-center rounded-sm border border-dashed border-primary/55 bg-background/75 px-4 py-3 text-center shadow-sm backdrop-blur-[2px] dark:bg-background/65"
+        >
+          <div className="flex max-w-md items-center gap-3 rounded-md bg-background/80 px-3 py-2 text-left shadow-sm ring-1 ring-border/60">
+            <span className="inline-flex h-9 w-9 shrink-0 items-center justify-center rounded-md bg-primary/10 text-primary">
+              <Paperclip className="h-4 w-4" />
+            </span>
+            <div className="min-w-0">
+              <div className="text-sm font-medium text-foreground">Drop files to attach</div>
+              <div className="mt-0.5 text-xs leading-5 text-muted-foreground">
+                Images insert into the reply. Other files are added to this issue.
+              </div>
+            </div>
+          </div>
+        </div>
+      ) : null}
+
       <MarkdownEditor
         ref={editorRef}
         value={body}
@@ -2265,6 +2350,51 @@ const IssueChatComposer = forwardRef<IssueChatComposerHandle, IssueChatComposerP
         </div>
       ) : null}
 
+      {composerAttachments.length > 0 ? (
+        <div
+          data-testid="issue-chat-composer-attachments"
+          className="mt-2 space-y-1.5 rounded-md border border-dashed border-border/80 bg-muted/20 p-2"
+        >
+          {composerAttachments.map((attachment) => {
+            const sizeLabel = formatAttachmentSize(attachment.size);
+            const statusLabel =
+              attachment.status === "uploading"
+                ? "Uploading to issue"
+                : attachment.status === "error"
+                  ? attachment.error ?? "Upload failed"
+                  : attachment.inline
+                    ? "Inserted inline"
+                    : "Attached to issue";
+            return (
+              <div
+                key={attachment.id}
+                className={cn(
+                  "flex min-w-0 items-center gap-2 rounded-sm px-2 py-1.5 text-xs",
+                  attachment.status === "error"
+                    ? "bg-destructive/10 text-destructive"
+                    : "bg-background/70 text-muted-foreground",
+                )}
+              >
+                {attachment.status === "uploading" ? (
+                  <Loader2 className="h-3.5 w-3.5 shrink-0 animate-spin" />
+                ) : attachment.status === "attached" ? (
+                  <Check className="h-3.5 w-3.5 shrink-0 text-green-600 dark:text-green-400" />
+                ) : (
+                  <AlertTriangle className="h-3.5 w-3.5 shrink-0" />
+                )}
+                <span className="min-w-0 flex-1 truncate font-medium text-foreground">
+                  {attachment.name}
+                </span>
+                {sizeLabel ? (
+                  <span className="shrink-0 text-muted-foreground">{sizeLabel}</span>
+                ) : null}
+                <span className="shrink-0 text-muted-foreground">{statusLabel}</span>
+              </div>
+            );
+          })}
+        </div>
+      ) : null}
+
       <div className="flex flex-wrap items-center justify-end gap-3">
         {(onImageUpload || onAttachImage) ? (
           <div className="mr-auto flex items-center gap-3">
diff --git a/ui/src/pages/IssueDetail.tsx b/ui/src/pages/IssueDetail.tsx
index a4345e0a616..45f13050d92 100644
--- a/ui/src/pages/IssueDetail.tsx
+++ b/ui/src/pages/IssueDetail.tsx
@@ -578,7 +578,7 @@ type IssueDetailChatTabProps = {
   ) => Promise<void>;
   onAdd: (body: string, reopen?: boolean, reassignment?: CommentReassignment) => Promise<void>;
   onImageUpload: (file: File) => Promise<string>;
-  onAttachImage: (file: File) => Promise<void>;
+  onAttachImage: (file: File) => Promise<IssueAttachment | void>;
   onInterruptQueued: (runId: string) => Promise<void>;
   onCancelQueued: (commentId: string) => void;
   interruptingQueuedRunId: string | null;
@@ -2543,7 +2543,7 @@ export function IssueDetail() {
     return attachment.contentPath;
   }, [uploadAttachment]);
   const handleCommentAttachImage = useCallback(async (file: File) => {
-    await uploadAttachment.mutateAsync(file);
+    return uploadAttachment.mutateAsync(file);
   }, [uploadAttachment]);
   const handleInterruptQueuedRun = useCallback(async (runId: string) => {
     await interruptQueuedComment.mutateAsync(runId);