The File In POP errors when the file parameter is empty in constant mode. In the other OP family cases they just throw a warning, the error seems a little heavy handed considering a use case may be to have the file POP empty sometimes and then loaded with a file at a later point.
Saying that it looks like it’s trying to read a file called None.
As a side note I couldn’t see the .pop file format in the tdu.fileTypes dictionary either so I guess it needs adding. I guess gltf should be in that dictionary too now?
