How to remove artboards from a Photoshop file so it can be opened in Fresco

I originally created a file in Fresco and started a sketch, then opened the same file in Photoshop to add color. While working in Photoshop, I added artboards to include reference images. Later, when I tried to reopen the file in Fresco to continue refining my sketch, Fresco would not open the file because it contains artboards—a feature that is not supported in Fresco.

My question is: how can I remove the artboards in a non-destructive way so that the file can be reopened in Fresco?