How to Identify background image

[taherte]

I've been having fun using Microsoft Publisher 2019 to design iron-on transfers for t-shirts. I have a lot of designs on various subjects that interest me. My question is how do I determine the image that was used as the background? During the design phase I pretty much know what files and images I am working with, but after they are complete and I open them again later, I don't see a way to see the file name so I can modify it or use it again. It would be nice to see it in Graphics Manager but it's not there.