Exporting to Piwigo problem

I am having an ongoing problem exporting my images to piwigo.

I have looked at every aspect of the difficulty and cannot find a solution.

My input appears to correctly ‘authenticate’ … so, I must assume that the input is correct.

I am able to correctly upload images by other means … only with dt is there a problem.

I am attaching a screencast in the hopes that somebody can see a less obvious error.
Screenshot_2023-06-03_18-10-41

Do you have any error messages?

I’d assume Adobe RGB isn’t great for web jpegs, but i wouldn’t think that’s the issue.

After a long pause I get the message “Cannot upload to Piwigo”
This is Manjaro/Arch/XFCE/git version.
Piwigo have been very unresponsive on the matter.

If you start darktable from the terminal, is there any relevent output?

Good question … I should have thought of that …
Unfortunately the export does not appear in the terminal text.
Fresh opening and directly to the export … Nothing!!