EDIT: As of Xcode 11.1 everything is working.
I'm adding a 3D model originally downloaded from Sketchfab, to my ARKit application. The model does show up in my scene, though it has no material applied. No matter what I do, the file in my Xcode project is un-savable.
The original file from Sketchfab comes down in .obj format. After unzipping, I import it in Blender, update the origin and export it as a .dae. The file's owner and group changes in each step of the process and I am taking steps to ensure it is my user and group who has ownership of the file.
The current file permissions on my .dae file are "-rwxrwxrwx@" I am unsure how much more permission I can give. The @ means extended file permissions which is common for Xcode project files.
It would be amazing if I could apply my textures, normals and get on with my project.