The last I knew, you can’t edit or work non–Google Drive documents via browser.
I’m thinking you’d have to download to your computer, work on it, then place back on Google Drive when done. In any event, I’ve always found it dangerous to work on a live document on the server or remotely. I think it’s best to work on your local machine and then back it up to the server/remote site when you are done.
I know your questions about the art were directed to Artwork Abode, but I would think the best way to do your art is an art folder for each job. For example, in my work flow, I have a main folder for each specific job. In that folder is my pages folder, fonts folder, art folder, etc.
Note: Personally, if my company ever thought of using Google Drive instead of our server, I’d be the first to object. I wouldn’t trust anything in the cloud with our livelihood. If Google has an outage for a day or two (or even hours), we’d be screwed.
Thankfully–we have a server, and if that ever craps the bed, we have twice-daily back-ups to external drives, as well as archives going back several years.
I’m curious as to why your company has such faith in getting rid of their servers and using Google Drive.