I would advise against Google Drive for document sharing. Recently I tried to share a trial build of an application (an exe I built) with a client. I zipped everything up and created a share link. Google auto-flagged it as a terms of service violation and blocked the file. No way of getting round it, and no way Google will bother to remedy the situation in time.

There's also OneDrive for business which seems to work well for sharing, though syncing options are totally broken. There's no way to selectively sync a share folder, so either you have your entire filesystem downloaded or you go online to get files. That sucks when your backup is terabytes of data.

I ended up sending a Dropbox link instead. So far it seems to be more or less foolproof.