I know Forma has Dropbox, and there's a hack to sync with Google Drive (though I'm afraid I can't wrap my head around that one - unless there's a guide for dummies...)
But, never thought to ask, are you able to wifi sync to your computer, to a book folder on your computer?
Or, send books wirelessly from your computer (chromebook) to your eReader?
Well, in my case it would be my Chromebook.
That would be the best solution for me next to syncing through Google Drive..
Or am I in the land of pipe dreams again