i used nginx once and i can see everything after the / in the access log

mega decrytion key is in the path

and mega is also close source with too much unnecessary bloat

just my option

what i will do is encrypt the zip file and upload it to mega

I don’t know what you have in mind with “trustworthy”, and about what, so maybe this comment is worthless for you. But I’ve been using their cloud storage for several years (like other commenters here), for work-related files, and to sync them between computers and phone. Their syncing system and apps are actually great. No complaints on my part.