I was having trouble uploading and was getting this message:

Invalid photo (CLERR002) AC4C4BF6-0396-4C95-AFAB-25961878CD81.heic

I just happened to get a Mac update a few days before and thought this might have something to do with it. HEIC is Apple's High Efficiency Image format. This format conflicts with eBay. So all the photos that I took with my Apple Iphone were in this format so they are now useless for eBay. The trick solution is to go to your phone settings, navigate to camera settings and open formats. High Efficiency saves photos a HEIC, while the Most Compatible option will save them as JPEG which is more easily loaded to eBay. 

I tested this and it works. The only problem is now I need to redo all my photos for my new listings. 

I hope this helps others having the same problem.