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/folder.repo.ts b/src/app/shared/services/api/folder.repo.ts
index 87ffa4ae3..e88f3450f 100644
--- a/src/app/shared/services/api/folder.repo.ts
+++ b/src/app/shared/services/api/folder.repo.ts
@@ -69,12 +69,12 @@ interface StelaFolder {
 	};
 	publicAt: string;
 	sort: string;
-	thumbnailUrls: {
-		'200': string;
-		'256': string;
-		'500': string;
-		'1000': string;
-		'2000': string;
+	thumbnailUrls?: {
+		'200'?: string;
+		'256'?: string;
+		'500'?: string;
+		'1000'?: string;
+		'2000'?: string;
 	};
 	type: string;
 	status: string;
diff --git a/src/app/shared/services/api/record.repo.spec.ts b/src/app/shared/services/api/record.repo.spec.ts
index 4cb1ebedc..c0403ec8e 100644
--- a/src/app/shared/services/api/record.repo.spec.ts
+++ b/src/app/shared/services/api/record.repo.spec.ts
@@ -7,11 +7,11 @@ import { of } from 'rxjs';
 import { environment } from '@root/environments/environment';
 import { HttpService } from '@shared/services/http/http.service';
 import {
+	convertStelaLocationToLocnVOData,
 	convertStelaRecordToRecordVO,
 	RecordRepo,
 	RecordResponse,
 	StelaLocation,
-	convertStelaLocationToLocnVOData,
 } from '@shared/services/api/record.repo';
 import { RecordVO } from '@root/app/models';
 import {
@@ -447,5 +447,24 @@ describe('RecordRepo', () => {
 
 			expect(record.displayTime).toBeUndefined();
 		});
+
+		it('maps thumbnailUrls to all thumb fields', () => {
+			const record = convertStelaRecordToRecordVO({
+				...baseStelaRecord,
+				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',
+				},
+			} as any);
+
+			expect(record.thumbURL200).toBe('https://example.com/200');
+			expect(record.thumbURL500).toBe('https://example.com/500');
+			expect(record.thumbURL1000).toBe('https://example.com/1000');
+			expect(record.thumbURL2000).toBe('https://example.com/2000');
+			expect(record.thumbnail256).toBe('https://example.com/256');
+		});
 	});
 });
diff --git a/src/app/shared/services/api/record.repo.ts b/src/app/shared/services/api/record.repo.ts
index d132d7121..b49354431 100644
--- a/src/app/shared/services/api/record.repo.ts
+++ b/src/app/shared/services/api/record.repo.ts
@@ -114,10 +114,13 @@ 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;
@@ -199,10 +202,14 @@ export const convertStelaRecordToRecordVO = (
 ): RecordVO =>
 	new RecordVO({
 		...stelaRecord,
-		thumbURL200: stelaRecord.thumbUrl200,
-		thumbURL500: stelaRecord.thumbUrl500,
-		thumbURL1000: stelaRecord.thumbUrl1000,
-		thumbURL2000: stelaRecord.thumbUrl2000,
+		thumbURL200: stelaRecord.thumbnailUrls?.['200'] ?? stelaRecord.thumbURL200,
+		thumbURL500: stelaRecord.thumbnailUrls?.['500'] ?? stelaRecord.thumbURL500,
+		thumbURL1000:
+			stelaRecord.thumbnailUrls?.['1000'] ?? stelaRecord.thumbURL1000,
+		thumbURL2000:
+			stelaRecord.thumbnailUrls?.['2000'] ?? stelaRecord.thumbURL2000,
+		thumbnail256:
+			stelaRecord.thumbnailUrls?.['256'] ?? stelaRecord.thumbnail256,
 		TagVOs: (stelaRecord.tags ?? []).map((stelaTag) =>
 			convertStelaTagToTagVO(stelaTag, stelaRecord.archiveId),
 		),
diff --git a/src/app/shared/services/data/data.service.spec.ts b/src/app/shared/services/data/data.service.spec.ts
index 7ade58a76..f62bc9afa 100644
--- a/src/app/shared/services/data/data.service.spec.ts
+++ b/src/app/shared/services/data/data.service.spec.ts
@@ -282,4 +282,78 @@ describe('DataService', () => {
 			})
 			.catch(done.fail);
 	});
+
+	it('should not add a lean item to thumbRefreshQueue when it has any thumbnail size', (done) => {
+		const service = TestBed.inject(DataService);
+		const api = TestBed.inject(ApiService);
+		const navigateResponse = new FolderResponse(navigateMinData);
+		const currentFolder = navigateResponse.getFolderVO(true) as FolderVO;
+		service.setCurrentFolder(currentFolder);
+
+		const record = currentFolder.ChildItemVOs.find(
+			(item) => item.isRecord,
+		) as RecordVO;
+		service.registerItem(record);
+
+		spyOn(api.folder, 'getWithChildren').and.returnValue(
+			Promise.resolve({
+				isSuccessful: true,
+				getFolderVO: () => ({
+					ChildItemVOs: [
+						{
+							folder_linkId: record.folder_linkId,
+							archiveNbr: record.archiveNbr,
+							parentFolderId: currentFolder.folderId,
+							thumbURL500: 'https://example.com/500',
+						},
+					],
+				}),
+			} as unknown as FolderResponse),
+		);
+
+		service
+			.fetchLeanItems([record])
+			.then(() => {
+				expect(record.thumbURL500).toBe('https://example.com/500');
+				expect(service.getThumbRefreshQueue()).not.toContain(record);
+				done();
+			})
+			.catch(done.fail);
+	});
+
+	it('should add a lean item to thumbRefreshQueue when no thumbnail size is present', (done) => {
+		const service = TestBed.inject(DataService);
+		const api = TestBed.inject(ApiService);
+		const navigateResponse = new FolderResponse(navigateMinData);
+		const currentFolder = navigateResponse.getFolderVO(true) as FolderVO;
+		service.setCurrentFolder(currentFolder);
+
+		const record = currentFolder.ChildItemVOs.find(
+			(item) => item.isRecord,
+		) as RecordVO;
+		service.registerItem(record);
+
+		spyOn(api.folder, 'getWithChildren').and.returnValue(
+			Promise.resolve({
+				isSuccessful: true,
+				getFolderVO: () => ({
+					ChildItemVOs: [
+						{
+							folder_linkId: record.folder_linkId,
+							archiveNbr: record.archiveNbr,
+							parentFolderId: currentFolder.folderId,
+						},
+					],
+				}),
+			} as unknown as FolderResponse),
+		);
+
+		service
+			.fetchLeanItems([record])
+			.then(() => {
+				expect(service.getThumbRefreshQueue()).toContain(record);
+				done();
+			})
+			.catch(done.fail);
+	});
 });
diff --git a/src/app/shared/services/data/data.service.ts b/src/app/shared/services/data/data.service.ts
index cf2385f7b..4a7ba8171 100644
--- a/src/app/shared/services/data/data.service.ts
+++ b/src/app/shared/services/data/data.service.ts
@@ -11,6 +11,7 @@ import {
 	RecordVOData,
 } from '@root/app/models';
 import { DataStatus } from '@models/data-status.enum';
+import { GetThumbnail } from '@models/get-thumbnail';
 import {
 	FolderResponse,
 	RecordResponse,
@@ -252,7 +253,7 @@ export class DataService {
 
 						if (
 							!item.isFolder &&
-							!item.thumbURL200 &&
+							!GetThumbnail(item) &&
 							item.parentFolderId === this.currentFolder.folderId
 						) {
 							this.debug('thumbRefreshQueue push %s', item.archiveNbr);