TS, not I wan to see u down.
U don’t have network knowledge, kenna scam to buy the switch . Now u Donnoe how to upload file.
NAS is not for non technical users like you.
My honest opinion.
But to answer your questions. From mobile you can just download their apps for u to upload or sync with your phone.
Desktop wise, u can just login to quick connect and upload . That’s it. Super simple. Donnoe why u so cui still wanna buy nas
True TS should put the NAS sell on Carousell but than also difficult to sell.
When people ask him for NAS basic stuff like Password, IP address etc.
He don't know than people will curse.
Difference between ONT, router and switch he don't know which is which.

Cause many of us here like

TS should stick with Google Drive more easier than NAS.
NAS wise TS should use his Skillsfuture go for basic networking course.
No need CCNA etc. level just basic networking especially what
is ONT, router and switch.
What is IP Address, Static and Dynamic IP address and how to set one.