If I click the plus sign next to “front-end” and enter a file name, then click “Add File”, it always adds the file to the back end. Trying to add a file to the back end also adds the new file to the back end, so it isn’t just reversed. This started happening tonight for me, on both Firefox and Edge.
The backend, front end distinction is based on the folder path. It’s the same folder structure as a normal web app, but for convenience we put stuff that starts with public/, views/, or templates/ in front end.
The only diff bw the add file buttons is the default placeholder path.
You should also be able to drag a file from back to front and vice versa (but let us know if that doesn’t work, I think we broke it)