Thanks. I did miss that one. I was looking for a "Add to this collection" button inside a selected collection.
However I'm not sure if this collection is visible only to a user that created it, or an admin has to create it and it is visible to everyone?
I'm still scared every time I have to update something, so I try to avoid updates if possible.
Most of the time when I had to update Windows or some software, something would break (and no previous bug would be fixed) and I would have to spend a whole day trying to fix the stupid issue.
TBH, I don't even remember if an update ever fixed something for me (but it probably happened at least once).