Custom API storage is missing from File Picker

In Classic App Builder, File Picker selects a storage configuration. If you have added a REST API resource but cannot select it for uploads, check whether a storage and its upload query have been configured.

Check the storage setup

1. Open the resource's Storages section in the Data Editor.

2. Use Create Storage if the required storage has not been configured.

3. Configure the required Upload query for your storage.

4. Return to File Picker and choose Save to Storage as its output format.

5. Select the configured storage and test with a small, non-sensitive file.

See Data Source Storage for the setup flow and File for File Picker settings.

I cannot bind the upload parameters

Check the upload endpoint's required body fields and encoding. The upload-query editor may not expose the same controls as the general REST API builder.

If a required input or binding control is unavailable, send support the app URL, storage type, required parameter names, and a sanitized screenshot of the upload-query editor. Explain which file or metadata value you need to pass. Do not include API keys or authorization headers.

Verify the upload

Check that the file reaches the intended storage and that the app record references the intended file. Confirm access using an end-user account before making the upload flow available to customers.

Last reviewed: September 16, 2026.