k5, thanks for your reply.

Actually that's exactly what I did. But after copying PWG_Stuffs into the plugin folder, it still does not show in the enabled/disabled plugin admin page. I tried closing and opening again the site, restarting Apache ... but no dice.

There must be some criteria that Piwigo follows when populating the available plugins from the 'plugins' folder, and that is what I'd like to know.

If all fails I will try to follow the code, but my experience with PHP is not very recent to say the least.
Tom

plg, thanks for your reply.

After reading your post, I downgraded my PHP to 7.3 but nothing has changed. I still can't see PWG Stuffs among my plugins.

Perhaps you can tell me how Piwigo decides which plugins to show or not on the admin plugins page? That would be helpful.

On the other side perhaps I managed to break something while configuring the site (several plugins were installable but didn't work) and a reinstall would be better ...

Tom

Thanks Flop25, yes the file is there.

What is not there is my brain. I just found the (very silly) error: I forgot to change the permissions on the PWG_Stuffs folder. I did it on the other plugin folder, but this was the last one to add, and I somehow forgot.

Ok, it's a silly error on my part, but a message from Piwigo about not being able to open a plugin folder could be useful perhaps.

Thanks to you all, for your help!
Tom

Ah, is that so? Well, case closed then.
Thanks for your help again
Tom