Diameter, diameter, diameter, alternator pulleys
Actually it took yet another step.
First. Wait for g**gle to process the upload to the Drive folder. Actually don't wait. Go get a beverage and do something else for an hour or two.
Then select 'Share' -> Create a link. Before copying that link, select allow others to share the link. Not sure if that's needed but I think it is.
Finally paste that link into the post.
Whew! Done. Hit post reply and see if it worked.