diff --git a/e2e/content-services/components/viewer-content-services-component.e2e.ts b/e2e/content-services/components/viewer-content-services-component.e2e.ts
index e748769b7f..752e4679fd 100644
--- a/e2e/content-services/components/viewer-content-services-component.e2e.ts
+++ b/e2e/content-services/components/viewer-content-services-component.e2e.ts
@@ -290,7 +290,9 @@ describe('Content Services Viewer', () => {
 
             await viewerPage.checkZoomInButtonIsNotDisplayed();
             await viewerPage.checkUnknownFormatIsDisplayed();
-            expect(await viewerPage.getUnknownFormatMessage()).toBe(`Couldn't load preview. Unknown format.`);
+            expect(await viewerPage.getUnknownFormatMessage()).toBe(
+                `Couldn't load preview. Unsupported file type or loading error. Please try refreshing the page.`
+            );
 
             await viewerPage.clickCloseButton();
         });
diff --git a/lib/core/src/lib/i18n/en.json b/lib/core/src/lib/i18n/en.json
index 50eb0530a6..52873ced9b 100644
--- a/lib/core/src/lib/i18n/en.json
+++ b/lib/core/src/lib/i18n/en.json
@@ -418,7 +418,7 @@
       "PAGE_SELECTOR_LABEL": "Page selector"
     },
     "LOADING": "Loading",
-    "UNKNOWN_FORMAT": "Couldn't load preview. Unknown format.",
+    "UNKNOWN_FORMAT": "Couldn't load preview. Unsupported file type or loading error. Please try refreshing the page.",
     "SIDEBAR": {
       "THUMBNAILS": {
         "PAGE": "Page {{ pageNum }}"