Progress bars are not proof the file finished processing.
The customer uploads a file, sees progress, and only later discovers it never processed correctly.
The problem
The customer uploads a file, sees progress, and only later discovers it never processed correctly.
When this breaks after deploy, the cost shows up as lost revenue, locked-out users, support load, or silent data mistakes — not as a red unit test in CI.
What can break
- progress completes without a result
- wrong file accepted
- oversized file accepted
- preview never appears
- error path missing
The critical flow
- 1select/drop file
- 2upload begins
- 3progress/status
- 4completion
- 5preview/result
- 6rejected type/size error
What Endia checks
File select/drop
Selecting an allowed fixture file starts the upload path
Progress visible
Progress/status UI updates during upload
Completion
Completion state appears only after processing finishes
Preview/result
Result/preview reflects the uploaded fixture name
Type rejection
Disallowed type is rejected with an error
Size rejection
Oversized file is rejected with an error
What evidence you get
Screenshots of progress/result/error states, step trace, and the release check result.
How it fits the Vercel preview gate
Gate preview changes that touch upload UI before customers lose documents mid-flow.
Try the protected flow (controlled fixture)
Neutral demonstration fixture — not a customer app, not live production data. Walk the flow Endia would record and replay on a Vercel preview.
Client-side only. Files never leave the browser. No public customer storage.
Known limitations
- Uses harmless client-side fixtures only — no public customer upload storage.
- Enforces type/size in the demo; production apps must keep server-side validation.
Protect a flow like this
Sign in to record your critical journey and run it on every Vercel preview.