Hello!
Ah, here’s a thought: did you clone the repository or download the zip?
If you downloaded the zip, check to make sure that GitHub included the PNG files as actual PNGs and not as git-lfs stubs. (You can do this by trying to open them in an image editor vs a text editor.)
If they are text files instead of image files, you can either download the image files individually through your web browser or delete your copy of the project and use git to clone the repo.
Let me know if that works!
