Hello !
Automatic update via admin to 13.7.
As mentioned above, automatic sorting of albums according to prefixed filters results in a "Bad request" error. Manual sorting by drag and drop works.

In admin/albums.php, line 28, replace:

if (!empty($_POST) or isset($_GET['delete']))

by

if (isset($_GET['delete']))

Thanks a bunch for timely and prompt response. I have change the code as per your instructions. Now sort out issue have resolved :)

I get the correct labels in French or in English for Piwigo 13.7. What language do you use ? Maybe it's a language question.

apply automatic sort order
Root
Album name, A → Z
Album name, Z → A
Album name, 1 → 5 → 10 → 100
Album name, 100 → 10 → 5 → 1
Date created, new → old
Date created, old → new
Date posted, new → old
Date posted, old → new

appliquer un ordre de tri automatique
Racine
Nom de l'album, A → Z
Nom de l'album, Z → A
Nom d'album, 1 → 5 → 10 → 100
Nom d'album, 100 → 10 → 5 → 1
Date de création, récent → ancien
Date de création, ancien → récent
Date d'ajout, récent → ancien
Date d'ajout, ancien → récent

AFAIK it still runs with older versions, but PHP 8.0 is recommended as older versions are EOL.

Piwigo just keeps getting better and better. It looks like a really nice and polished product, works reliably, and it's easy to use.
One thing I especially appreciate, is how easy it is to update. There are still contemporary self hosted software packages out there that must be updated manually and it can be a major pain the ass, resulting in avoiding updating. Piwigo ... one click and done. Beautiful.
Really appreciate having mobile upload now too.

Thank you once again. Happy to be using Piwigo for more than 6 years now.
Together with Alloyphoto Lightroom plugin + Piwigo iOS app ... perfect. Powerful and versatile.

@mk23
happy to help you, but please post your own new topic in "How-To and Troubleshooting", not Announcements. Thanks.