@mariosipad
thanks for reply and let's continue...
1. Primarily 4 different folders:
containing photos
containing videos
containing documents
containing miscellaneous
2. For me and others
3. From Windows PC/Android tablets and smartphones
Generally I like to work on documents during holidays and share folders with pictures with friends. Additionally I like to allow downloads of eg music to friends
The background is the following: I just run a website with these infos, mainly photos from travelling etc and I want to cancel this website - private websites are not very common nowadays, I have to update them regulary and it costs in the meantime 12 €uro/Month. The storage at IONOS 1&1 is 500GB/260,000 files. As long as I used the website for the storage of the calibre library it was a very welcome webspace, but now with the Raspi4B it is not longer necessary.
I like to make use of the photo library (I use phototonic at the PI) and share pictures of our travellings as used before with the website eg
https://www.haselau.eu/xxx.html
and make folders with music (eg just an album with 12 tracks in mp3) available to friends for download
Hope this answer is sufficient - unfortunately, I own two Synology DS220j and DS120j, not the +version. When I bought them years ago I did not think that I sometimes like to run a webserver...