diff --git a/src/app/shared/services/api/base.ts b/src/app/shared/services/api/base.ts
index 429eeef8c..eb4210214 100644
--- a/src/app/shared/services/api/base.ts
+++ b/src/app/shared/services/api/base.ts
@@ -105,6 +105,7 @@ export const LeanWhitelist = [
 	'thumbURL500',
 	'thumbURL1000',
 	'thumbURL2000',
+	'thumbnail256',
 	'thumbDT',
 	'refArchiveNbr',
 	'folder_linkId',
diff --git a/src/app/shared/services/api/record.repo.spec.ts b/src/app/shared/services/api/record.repo.spec.ts
index b027956b1..0cffe98e8 100644
--- a/src/app/shared/services/api/record.repo.spec.ts
+++ b/src/app/shared/services/api/record.repo.spec.ts
@@ -6,7 +6,12 @@ import {
 import { of } from 'rxjs';
 import { environment } from '@root/environments/environment';
 import { HttpService } from '@shared/services/http/http.service';
-import { RecordRepo, RecordResponse } from '@shared/services/api/record.repo';
+import {
+	convertStelaRecordToRecordVO,
+	RecordRepo,
+	RecordResponse,
+	StelaRecord,
+} from '@shared/services/api/record.repo';
 import { RecordVO } from '@root/app/models';
 import {
 	provideHttpClient,
@@ -15,6 +20,44 @@ import {
 import { ShareLink } from '@root/app/share-links/models/share-link';
 import { HttpV2Service } from '../http-v2/http-v2.service';
 
+describe('convertStelaRecordToRecordVO', () => {
+	it('maps thumbnailUrls to all thumb fields', () => {
+		const stelaRecord = {
+			recordId: 1,
+			displayName: 'Test',
+			archiveNumber: 'arch-1',
+			displayDate: '2025-01-01',
+			folderLinkId: '1',
+			folderLinkType: 'type.folder_link.private',
+			parentFolderLinkId: '2',
+			thumbnailUrls: {
+				'200': 'https://example.com/200',
+				'256': 'https://example.com/256',
+				'500': 'https://example.com/500',
+				'1000': 'https://example.com/1000',
+				'2000': 'https://example.com/2000',
+			},
+			location: null,
+			files: [],
+			createdAt: '2025-01-01',
+			updatedAt: '2025-01-01',
+			archive: { id: '1', name: 'Archive', thumbURL200: '' },
+			shares: null,
+			tags: null,
+		};
+
+		const result = convertStelaRecordToRecordVO(
+			stelaRecord as unknown as StelaRecord,
+		);
+
+		expect(result.thumbURL200).toBe('https://example.com/200');
+		expect(result.thumbURL500).toBe('https://example.com/500');
+		expect(result.thumbURL1000).toBe('https://example.com/1000');
+		expect(result.thumbURL2000).toBe('https://example.com/2000');
+		expect(result.thumbnail256).toBe('https://example.com/256');
+	});
+});
+
 describe('RecordRepo', () => {
 	let repo: RecordRepo;
 	let httpMock: HttpTestingController;
diff --git a/src/app/shared/services/api/record.repo.ts b/src/app/shared/services/api/record.repo.ts
index b39dfb2cd..eb98be7cf 100644
--- a/src/app/shared/services/api/record.repo.ts
+++ b/src/app/shared/services/api/record.repo.ts
@@ -104,10 +104,13 @@ export type StelaRecord = Omit<RecordVO, 'files'> & {
 	folderLinkId: string;
 	folderLinkType: FolderLinkType;
 	parentFolderLinkId: string;
-	thumbUrl200: string;
-	thumbUrl500: string;
-	thumbUrl1000: string;
-	thumbUrl2000: string;
+	thumbnailUrls: {
+		'200': string;
+		'256': string;
+		'500': string;
+		'1000': string;
+		'2000': string;
+	};
 	location: StelaLocation | null;
 	files: Array<StelaFile>;
 	createdAt: string;
@@ -171,10 +174,11 @@ export const convertStelaRecordToRecordVO = (
 ): RecordVO =>
 	new RecordVO({
 		...stelaRecord,
-		thumbURL200: stelaRecord.thumbUrl200,
-		thumbURL500: stelaRecord.thumbUrl500,
-		thumbURL1000: stelaRecord.thumbUrl1000,
-		thumbURL2000: stelaRecord.thumbUrl2000,
+		thumbURL200: stelaRecord.thumbnailUrls?.['200'],
+		thumbURL500: stelaRecord.thumbnailUrls?.['500'],
+		thumbURL1000: stelaRecord.thumbnailUrls?.['1000'],
+		thumbURL2000: stelaRecord.thumbnailUrls?.['2000'],
+		thumbnail256: stelaRecord.thumbnailUrls?.['256'],
 		TagVOs: (stelaRecord.tags ?? []).map((stelaTag) =>
 			convertStelaTagToTagVO(stelaTag, stelaRecord.archiveId),
 		),
diff --git a/src/app/shared/services/data/data.service.ts b/src/app/shared/services/data/data.service.ts
index cf2385f7b..1ce6c7eb5 100644
--- a/src/app/shared/services/data/data.service.ts
+++ b/src/app/shared/services/data/data.service.ts
@@ -253,6 +253,7 @@ export class DataService {
 						if (
 							!item.isFolder &&
 							!item.thumbURL200 &&
+							!item.thumbnail256 &&
 							item.parentFolderId === this.currentFolder.folderId
 						) {
 							this.debug('thumbRefreshQueue push %s', item.archiveNbr);