I'm following a tutorial on exporting UV maps to Photoshop. I only have Gimp, but I figured the principals are the same. I went to UVs -> Export UV layout. Then I saved the PNG file to my computer. Then I went into Gimp and opened the PNG file. But all I see is an alpha background in the proportions and scale of my UV map. There is no UV map, no colors, nothing. Any idea what I'm doing wrong?