So the subject sorta explains most of it. I was commissioned to do a custom decor and have been trying to submit it, but each time I try it tells me Invalid cub image. My images comes from the size of the provided base that I'd didn't alter. However to try and fix the issue I uploaded the image to a second website to link instead of the other website I was using. Yet it still kept telling me Invalid cub image, and I don't know what else I can do to fix it.