[odorousrex]

Possible business opportunity here?

I think $10 for a windows/mac/linux desktop app, $5 for a android/Ios version. (Maybe get all versions for $20)

You drop in an S3 or Azure storage key, it lists the files, create containers, lets you upload/download to whatever device you are on at the time.

Not necessarily a dropbox killer since you'd have to have a cloud storage account and no how to use it, but it would definitely serve a certain niche.