diff --git a/web/src/components/AttachmentLibrary/AttachmentMediaGrid.tsx b/web/src/components/AttachmentLibrary/AttachmentMediaGrid.tsx
index 37cf475e..6c7463cc 100644
--- a/web/src/components/AttachmentLibrary/AttachmentMediaGrid.tsx
+++ b/web/src/components/AttachmentLibrary/AttachmentMediaGrid.tsx
@@ -4,7 +4,7 @@ import { Badge } from "@/components/ui/badge";
 import VideoPoster from "@/components/VideoPoster";
 import type { AttachmentLibraryMediaItem, AttachmentLibraryMonthGroup } from "@/hooks/useAttachmentLibrary";
 import { useTranslate } from "@/utils/i18n";
-import { AttachmentMetadataLine, AttachmentOpenButton } from "./AttachmentLibraryPrimitives";
+import { AttachmentMetadataLine, AttachmentOpenButton, AttachmentSourceChip } from "./AttachmentLibraryPrimitives";
 
 interface AttachmentMediaGridProps {
   groups: AttachmentLibraryMonthGroup[];
@@ -60,12 +60,12 @@ const AttachmentMediaCard = ({ item, onPreview }: { item: AttachmentLibraryMedia
           )}
         </div>
 
+        <AttachmentMetadataLine
+          className="min-w-0"
+          items={[item.fileTypeLabel, item.createdLabel !== "—" ? item.createdLabel : undefined]}
+        />
         <div className="flex items-center justify-between gap-2">
-          <AttachmentMetadataLine
-            className="min-w-0 flex-1"
-            items={[item.fileTypeLabel, item.createdLabel !== "—" ? item.createdLabel : undefined]}
-          />
-
+          <AttachmentSourceChip memoName={item.memoName} />
           <AttachmentOpenButton href={item.sourceUrl} />
         </div>
       </div>
diff --git a/web/src/hooks/useAttachmentLibrary.ts b/web/src/hooks/useAttachmentLibrary.ts
index e475b93b..a9679c59 100644
--- a/web/src/hooks/useAttachmentLibrary.ts
+++ b/web/src/hooks/useAttachmentLibrary.ts
@@ -37,6 +37,7 @@ export interface AttachmentLibraryMediaItem extends AttachmentVisualItem {
   createdAt?: Date;
   createdLabel: string;
   fileTypeLabel: string;
+  memoName?: string;
 }
 
 export interface AttachmentLibraryMonthGroup {
@@ -96,6 +97,7 @@ const toLibraryMediaItem = (item: AttachmentVisualItem, locale: string, livePhot
     createdAt,
     createdLabel: formatCreatedAt(createdAt, locale),
     fileTypeLabel: item.kind === "motion" ? livePhotoLabel : fileTypeLabel,
+    memoName: primaryAttachment.memo,
   };
 };
 
diff --git a/web/tests/attachment-library-source-link.test.tsx b/web/tests/attachment-library-source-link.test.tsx
new file mode 100644
index 00000000..2f961969
--- /dev/null
+++ b/web/tests/attachment-library-source-link.test.tsx
@@ -0,0 +1,65 @@
+import { create } from "@bufbuild/protobuf";
+import { fireEvent, render, screen } from "@testing-library/react";
+import { MemoryRouter } from "react-router-dom";
+import { describe, expect, it, vi } from "vitest";
+import AttachmentMediaGrid from "@/components/AttachmentLibrary/AttachmentMediaGrid";
+import type { AttachmentLibraryMonthGroup } from "@/hooks/useAttachmentLibrary";
+import { AttachmentSchema } from "@/types/proto/api/v1/attachment_service_pb";
+
+vi.mock("@/utils/i18n", () => ({ useTranslate: () => (key: string) => key }));
+
+describe("<AttachmentMediaGrid>", () => {
+  it("links a media attachment to its source memo without replacing the direct file action", () => {
+    const attachment = create(AttachmentSchema, {
+      name: "attachments/photo",
+      filename: "photo.jpg",
+      type: "image/jpeg",
+      memo: "memos/source-memo",
+    });
+    const groups: AttachmentLibraryMonthGroup[] = [
+      {
+        key: "2026-07",
+        label: "Jul 2026",
+        items: [
+          {
+            id: attachment.name,
+            kind: "image",
+            filename: attachment.filename,
+            posterUrl: "/file/attachments/photo/photo.jpg?thumbnail=1",
+            sourceUrl: "/file/attachments/photo/photo.jpg",
+            attachmentNames: [attachment.name],
+            attachments: [attachment],
+            previewItem: {
+              id: attachment.name,
+              kind: "image",
+              filename: attachment.filename,
+              sourceUrl: "/file/attachments/photo/photo.jpg",
+            },
+            mimeType: attachment.type,
+            primaryAttachment: attachment,
+            createdLabel: "Jul 29, 2026",
+            fileTypeLabel: "JPEG",
+            memoName: attachment.memo,
+          },
+        ],
+      },
+    ];
+    const onPreview = vi.fn();
+
+    render(
+      <MemoryRouter>
+        <AttachmentMediaGrid groups={groups} onPreview={onPreview} />
+      </MemoryRouter>,
+    );
+
+    const memoLink = screen.getByRole("link", { name: "attachment-library.labels.memo" });
+    expect(memoLink).toHaveAttribute("href", "/memos/source-memo");
+
+    const fileLink = screen.getByRole("link", { name: "attachment-library.actions.open" });
+    expect(fileLink).toHaveAttribute("href", "/file/attachments/photo/photo.jpg");
+    expect(fileLink).toHaveAttribute("target", "_blank");
+
+    fireEvent.click(memoLink);
+    expect(onPreview).not.toHaveBeenCalled();
+  });
+});