Can't delete files from a copied project

Project 5b75ac7ce4e2b41ed5dbd955. I copied then modified this project. There are 2 uploaded files that I don’t need, but can’t delete, but I was able to rename them. I have one called cantdelete.png and one called cantdelete.pdf. I tried to also copy the completed project and delete the files, but I can’t delete them from there either.

you will be a replace the png to the real app its working

If you have problems with deleting files, copying or sharing a project, beware, because you can lose this project if you continue to work with it. If you have a recently saved copy of this project with which there are no such problems, then go back to it.