Correct permissions and broken Admin panel

[talesam]

Can anyone tell me what is the correct permission of forum flarum folders and files?
I set Owner and group to www-data, but if I stop the container and go up it leaves some like 991 and about the permissions of folders and files, is there a script to configure everything correctly? for example, I was having trouble uploading an avatar, so I gave permission 755 to the avatars folder.

The admin panel is kind of broken and I still don't know how to fix it.