thanks again for the clarification.
I have used a wireguard instance for my father's synology couple years ago following some tutorials since his account was having problems using the synology quickconnect for some reason ( solved by the support )
Anyway, yeah I remember it was kinda of an hassle to setup and explain to him multiple times the process...and to be honest i quite forget most of it myself...
On Android one can't just run one app via vpn right??
like tunneling just the nextcloud app and leavin the rest alone..