Deployed Data App File Upload Widget fails with "Did not restore content, try to re-execute" and ...

I'm hoping someone has come across this before as I'm struggling to identify the root cause.

Background

I have a KNIME workflow that was deployed as a Data App approximately a year ago and was working successfully. The workflow allows a user to:

  1. Upload an Excel (.xlsx) file using a File Upload Widget.

  2. Process the uploaded file.

  3. Enter/select an output file name.

  4. Download the processed file.

I've recently come back to make some updates but discovered the deployed Data App no longer works.

Current Behaviour

The workflow runs successfully in KNIME Analytics Platform locally and processes the same test file without any issues.

However, when using the deployed Data App:

  1. I select an Excel (.xlsx) file in the File Upload Widget.

  2. The upload appears to complete.

  3. The workflow never proceeds beyond the File Upload Widget.

  4. The widget displays:

“Did not restore content, try to re-execute” The page also shows: “Input is required”

The workflow never gets to the next page or any of the processing components.

What I've Investigated

  • The workflow executes correctly locally.

  • The issue occurs only in the deployed Data App.

  • The failure appears to occur within the File Upload Widget itself before any downstream processing.

  • I initially suspected a workflow issue, but the logs suggest the upload component is failing first.

Relevant Log Entries

The deployment log repeatedly reports:

Node : 3:3:10:0:9 : File with no extension is not valid

File Upload Widget

File with no extension is not valid

Afterwards I see downstream warnings such as: “Component does not have input data, execute upstream nodes first” and “Errors overwriting node settings with flow variables: Unknown variable "file-name""

My assumption is that those downstream warnings are a result of the File Upload Widget failing rather than being the root cause.

Questions

Has anyone seen a File Upload Widget report: “File with no extension is not valid” when uploading a valid .xlsx file through a deployed Data App?

  1. Has there been any change in File Upload Widget behaviour between recent KNIME versions that could affect older deployments?

  2. Could a Business Hub / Server upgrade cause uploaded files to lose their extension or filename metadata during validation?

  3. Is there a known issue with older File Upload Widgets or Data Apps that may require the upload component to be rebuilt?

  4. Are there any recommended diagnostics to determine what filename or file metadata the deployed File Upload Widget is actually receiving?

Additional Information

  • Workflow works locally without issue.

  • Failure occurs only in deployment.

  • Error occurs inside the File Upload Widget before any processing starts.

  • The original deployment has been in place for approximately one year.

Any suggestions would be greatly appreciated. If helpful, I can also provide screenshots of the File Upload Widget configuration and details of the KNIME Analytics Platform and Business Hub/Server versions.

Thanks in advance for any help!