Thank you for reply @anon21401411
Indeed, Data is very important, that’s why i recently bought this NAS, to include old photos , videos, basically memories that i want to preserve as much as possible. I can upload via FTP to be honest in a photo or video folder and use VLC to cast/see the media on NAS. But having a cloud like dropbox, icloud , sounds more interesting and flexible
If there’s anyone that knows a way to upgrade PHP from 5 to 7 to have the latest owncloud software available that would be amazing, until then i’ll have to stay with Icloud for a while 
It’s not only for me, but there are lots of old zyxel nas’s users that have experienced the same issue as mine, maybe there’s a fix for us too !
Thank you !