Google Drive – How to Set Multiple Owners for a Google Drive Folder

The only way I have found to do this is to add the link to the shared folder on your site. This will then open in a new browser tab. Not as good as the embedded, but it works.

I've tried using iframes with the folder url but they are blank - no idea why.

Here's an answer, though you might not like it:

http://support.google.com/drive/bin/answer.py?hl=en&answer=2494892

Once you transfer ownership of a file, you lose ownership for yourself. You effectively change the doc from something you own to something that was "shared with you."

There is no way to downgrade a user back to editor unless you contact them to make you the owner again (you can't complete this change once you transfer ownership)