fix: separate resource previews from downloads

src/worker/onenote.worker.ts

@@ -168,14 +168,19 @@ async function handleRequest(data: WorkerRequest): Promise<void> {
       const resource = session.resources.get(
         workerResourceKey(data.resourceId, data.sectionId)
       );
-      const payload = resource ? resourcePayload(resource) : undefined;
+      const payload = resource
+        ? resourcePayload(resource, data.intent)
+        : undefined;
       if (!payload) {
         workerScope.postMessage({
           type: 'failure',
           requestId: data.requestId,
           error: {
             code: 'resource-not-available',
-            message: 'The selected embedded resource is not available.',
+            message:
+              data.intent === 'preview' && resource
+                ? 'This image can be downloaded but is not approved for automatic preview.'
+                : 'The selected embedded resource is not available.',
             recoverable: true,
           },
         });