@mariosipad
...of course not!
just to finalize: it's not the good will but the lack of knowledge of my friends, they are really not interested in learning how these things are going. Many of them had to make use of computers during their last years of profession and were happy to leave these unloved items. Today, they use (for sure they have pcs/tablets/smartphones, because friends and neighbours own them, too) these items mainly to view pictures from their grandsons, write some memos via whatsapp, read the newspaper on the tablet (yes, because it's much cheaper than to buy the printed press) and have their "Bundesliga" football
Haven't tried out Jellyfin for a long time (2 days or so), but wasn't very enthused.
To play music and view pictures mainly meets my requirements, but (I don't remember): the program must be able to allow the download of a total folder, not just single files
Generally, music (view, listen and download) is not important/necessary; the few folders of music transfer can be done by google drive. Really of main interest is the section photos/videos (view and download). Ca 14,000 pics: well, photography is one of my main hobbies and I very often offer links for viewing and downloads via my (still existing) website.
phototonic is on both my PIs, descrpition
https://github.com/oferkv/phototonic
There is a screenshot of the program/menu via a kind of a browser - that's the thing I would appreciate to make visible to my friends (but: no download possible)