Note: no dev version checked out to verify it is still an issue.
Issue
On a file / image field you can save an invalid folder name, like "public://" which was incorrectly migrated with the FileField settings.
When trying to upload a file, you will get a generic File could not be uploaded error.
I am on a Windows box, so : is an invalid character, and // would also be invalid on any system (empty string as a folder name).
Suggested possible solution
Using tokens here would make the issue even worse, and make validation nearly impossible here. So maybe ensure a clean folder path when creating the directory during the save process?
Needs work
11.0 🔥
file.module
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Currently in Drupal 11.x, it still allows to provide folder path like "public://".
I believe we should add a validation to ensure that path doesn't contain URI scheme field in the path.
We can use the stream_wrapper_manager service to fetch all the schemes and validate that path doesn't contain string like "{uri_stream}://"