diff --git a/dashboard/src/components/document-sandbox.tsx b/dashboard/src/components/document-sandbox.tsx
index d06df4eb..d69608f9 100644
--- a/dashboard/src/components/document-sandbox.tsx
+++ b/dashboard/src/components/document-sandbox.tsx
@@ -15,6 +15,7 @@ import {
   isDocumentJobActive,
   DocumentUploadError,
   parseDocumentSandboxSession,
+  resolveDocumentSandboxSessionRestore,
   SANDBOX_FORBIDDEN_MESSAGE,
   serializeDocumentSandboxSession,
   type DocumentJobResult,
@@ -79,7 +80,14 @@ export function DocumentSandbox() {
   }
 
   useEffect(() => {
-    const session = parseDocumentSandboxSession(window.sessionStorage.getItem(SANDBOX_SESSION_STORAGE_KEY));
+    let session: ReturnType<typeof parseDocumentSandboxSession>;
+    try {
+      session = parseDocumentSandboxSession(window.sessionStorage.getItem(SANDBOX_SESSION_STORAGE_KEY));
+    } catch {
+      setMessage("This browser cannot access the previous sandbox OCR session.");
+      setRestoring(false);
+      return;
+    }
     if (!session) {
       setRestoring(false);
       return;
@@ -89,24 +97,35 @@ export function DocumentSandbox() {
     setMessage("Restoring the last sandbox OCR session…");
     void (async () => {
       try {
-        const [restoredUpload, restoredJob] = await Promise.all([
+        const [uploadResult, jobResult] = await Promise.allSettled([
           session.upload_id ? getSandboxDocumentStatus(session.upload_id) : Promise.resolve(null),
           session.job_id ? getSandboxDocumentJobStatus(session.job_id) : Promise.resolve(null),
         ]);
         if (cancelled) return;
+        const restored = resolveDocumentSandboxSessionRestore(uploadResult, jobResult);
+        const { upload: restoredUpload, job: restoredJob } = restored;
         if (restoredUpload) setUpload(restoredUpload);
+        if (restored.uploadUnavailable) recordActivity("The previous sandbox upload is no longer available.");
         if (restoredJob) {
           setJob(restoredJob);
           recordActivity(`OCR job status restored: ${restoredJob.status}.`);
           if (RESULT_READY_JOB_STATUSES.has(restoredJob.status)) {
             try {
-              setResult(await getSandboxDocumentJobResult(restoredJob.job_id));
+              const restoredResult = await getSandboxDocumentJobResult(restoredJob.job_id);
+              if (!cancelled) setResult(restoredResult);
             } catch (error) {
               if (!(error instanceof DocumentResultNotReadyError)) throw error;
             }
           }
         }
-        if (!cancelled) setMessage("The last sandbox OCR session was restored.");
+        if (restored.jobUnavailable) recordActivity("The previous sandbox OCR job is no longer available.");
+        if (!cancelled) {
+          setMessage(
+            restoredUpload || restoredJob
+              ? "The last sandbox OCR session was restored."
+              : "The previous sandbox OCR session is no longer available.",
+          );
+        }
       } catch (error) {
         if (!cancelled) {
           setMessage(describe(error, "The previous sandbox OCR session could not be restored. Try refreshing again shortly."));
diff --git a/dashboard/src/lib/document-intelligence.test.ts b/dashboard/src/lib/document-intelligence.test.ts
index 3e288fea..ead33c6f 100644
--- a/dashboard/src/lib/document-intelligence.test.ts
+++ b/dashboard/src/lib/document-intelligence.test.ts
@@ -11,6 +11,7 @@ import {
   parseDocumentJobState,
   parseDocumentSandboxSession,
   parseDocumentUploadState,
+  resolveDocumentSandboxSessionRestore,
 } from "./document-intelligence.ts";
 
 test("restores only opaque sandbox identifiers from a browser session", () => {
@@ -26,6 +27,21 @@ test("rejects browser session data that includes document content or invalid ide
   assert.equal(parseDocumentSandboxSession("not json"), null);
 });
 
+test("keeps an authorized OCR job when its upload record can no longer be restored", () => {
+  assert.deepEqual(
+    resolveDocumentSandboxSessionRestore(
+      { status: "rejected", reason: new Error("upload expired") },
+      { status: "fulfilled", value: { job_id: "job_01TEST", status: "completed" } },
+    ),
+    {
+      upload: null,
+      job: { job_id: "job_01TEST", status: "completed" },
+      uploadUnavailable: true,
+      jobUnavailable: false,
+    },
+  );
+});
+
 test("allows cancellation only while an OCR job is non-terminal", () => {
   assert.equal(canCancelDocumentJob("accepted"), true);
   assert.equal(canCancelDocumentJob("processing"), true);
diff --git a/dashboard/src/lib/document-intelligence.ts b/dashboard/src/lib/document-intelligence.ts
index 203a15bb..9be2e387 100644
--- a/dashboard/src/lib/document-intelligence.ts
+++ b/dashboard/src/lib/document-intelligence.ts
@@ -37,6 +37,13 @@ export type DocumentSandboxSession = {
   job_id?: string;
 };
 
+export type DocumentSandboxSessionRestore = {
+  upload: DocumentUploadState | null;
+  job: DocumentJobState | null;
+  uploadUnavailable: boolean;
+  jobUnavailable: boolean;
+};
+
 export type DocumentJobProgress = {
   stage: "queued" | "preparing" | "extracting" | "validating" | "complete" | "attention" | "cancelled";
   message: string;
@@ -159,6 +166,18 @@ export function parseDocumentSandboxSession(value: string | null): DocumentSandb
   }
 }
 
+export function resolveDocumentSandboxSessionRestore(
+  upload: PromiseSettledResult<DocumentUploadState | null>,
+  job: PromiseSettledResult<DocumentJobState | null>,
+): DocumentSandboxSessionRestore {
+  return {
+    upload: upload.status === "fulfilled" ? upload.value : null,
+    job: job.status === "fulfilled" ? job.value : null,
+    uploadUnavailable: upload.status === "rejected",
+    jobUnavailable: job.status === "rejected",
+  };
+}
+
 export function serializeDocumentSandboxSession(session: DocumentSandboxSession): string {
   return JSON.stringify(session);
 }