diff --git a/backend/src/main/java/org/raddatz/familienarchiv/dashboard/DashboardService.java b/backend/src/main/java/org/raddatz/familienarchiv/dashboard/DashboardService.java
index 054ea91b..0e5203b2 100644
--- a/backend/src/main/java/org/raddatz/familienarchiv/dashboard/DashboardService.java
+++ b/backend/src/main/java/org/raddatz/familienarchiv/dashboard/DashboardService.java
@@ -82,7 +82,7 @@ public class DashboardService {
                 .toList();
 
         return new DashboardResumeDTO(docId, doc.getTitle(), caption, excerpt,
-                totalBlocks, pct, null, collaborators);
+                totalBlocks, pct, doc.getThumbnailUrl(), collaborators);
     }
 
     public DashboardPulseDTO getPulse(UUID userId) {
diff --git a/backend/src/test/java/org/raddatz/familienarchiv/dashboard/DashboardServiceTest.java b/backend/src/test/java/org/raddatz/familienarchiv/dashboard/DashboardServiceTest.java
index 19a20e51..d9df35cc 100644
--- a/backend/src/test/java/org/raddatz/familienarchiv/dashboard/DashboardServiceTest.java
+++ b/backend/src/test/java/org/raddatz/familienarchiv/dashboard/DashboardServiceTest.java
@@ -18,6 +18,7 @@ import org.raddatz.familienarchiv.service.TranscriptionService;
 import org.raddatz.familienarchiv.service.UserService;
 
 import java.time.Instant;
+import java.time.LocalDateTime;
 import java.time.OffsetDateTime;
 import java.util.HashSet;
 import java.util.List;
@@ -45,6 +46,31 @@ class DashboardServiceTest {
 
     @InjectMocks DashboardService dashboardService;
 
+    // ─── getResume wires thumbnailUrl from Document ───────────────────────────
+
+    @Test
+    void getResume_populatesThumbnailUrl_fromDocument() {
+        UUID userId = UUID.randomUUID();
+        UUID docId = UUID.fromString("12345678-aaaa-bbbb-cccc-1234567890ab");
+
+        Document doc = Document.builder()
+                .id(docId).title("Brief").originalFilename("brief.pdf")
+                .thumbnailKey("thumbnails/" + docId + ".jpg")
+                .thumbnailGeneratedAt(LocalDateTime.of(2026, 4, 23, 9, 0, 0))
+                .receivers(new HashSet<>())
+                .build();
+
+        when(auditLogQueryService.findMostRecentDocumentForUser(userId)).thenReturn(Optional.of(docId));
+        when(documentService.getDocumentById(docId)).thenReturn(doc);
+        when(transcriptionService.listBlocks(docId)).thenReturn(List.of());
+
+        DashboardResumeDTO result = dashboardService.getResume(userId);
+
+        assertThat(result).isNotNull();
+        assertThat(result.thumbnailUrl()).isEqualTo(doc.getThumbnailUrl());
+        assertThat(result.thumbnailUrl()).startsWith("/api/documents/" + docId + "/thumbnail?v=");
+    }
+
     // ─── toActorDTO (via getResume collaborators) ─────────────────────────────
 
     @Test