Hey!
i just checked for you and it appears there is an error message:
{"error":"Supported image formats are: gif, jpeg, and png"}
so be sure to upload only images that are actually gif, jpg or png... sometimes they are labelled as .jpg but in fact they are not. If you save them from the internet then make sure you save them with the right file extension.
hope that helps! you're nearly there!
Thank You.
I was trying to load them from my Google photos.
I'm working on it now and found that from Google photos I first have to right click and save as. That loaded the still photo. It is not working for their animated photos. (Animated photos are like making your own GIFs in Google Photos.) But Im still trying.