About: Note on october 30 2022: I couldn't upload the last 3.5 Charlie's version, so you will find it (and some olders) here https://dodin.fr.cr/nextcloud/s/GR48f26b3r3zrtC
this 3.5 version works with Piwigo 13 and php up to 8.2 (AFAIK).
Seams to work (at least works for me) with Piwigo 13 on october 12, 2022, also with php 8.1 - jdd.
Did you ever want to add none picture files to your gallery ( eg. .flv, .mp3, .pdf or any data files, now also html5)?
"Charlies content" is a global solution for those files.
Add charlies_content to your gallery, and enjoy it. I'm not at all familiar with github, so install manually (it's very easy).
It's necessary to install it manually, just copy the archive content to the plugins folder. the plugin folder name have to be "charlies" or any other, but without . or -