Unknown person requesting access to file that I have never shared

Due to work I can't disclose my identiy on social media, so my Facebook is a totally different name/person/email and locked down tight.

On facebook I am in a group where the page owner designs and sells files.

To buy the files you go through Paypal (not facebook)

The purchased files are then sent direct to my gmail address.

I have downloaded them and saved them to my google drive.

I had a problem opening some and placed a screenshot on the faceebok page where they come from of how the files looked in my google drive.  I could not see any identifying details on the post (that I am aware of)  The page address was on the screenshot but I got my daughter to check it on another computer and she said it didn't come up with anything.

Soon after posting the screenshot, I have been receiving requests to access that actual file in google drive and I dont know how they found it to ask?

As I said there is absolutely no way to link my Fb to my gmail so Im a little concerned and worried that I need to do something to google drive to stop this happening.

If anyone can help it would be extremely appreciated as I freaking out.  Thank you in advance