I wish the glowforge would use DXF automatically. Until it does, this is the process I use to process files to cut. I go through how I use an online converter then scale and import into the GFUI. I also show how I process a converted file to select which vectors to score or cut. I also make two cut layers so I can control the order of the cuts to ensure internal features are cut before outside ones.
I know you can do the conversion in inkscape directly, but everytime I do it, the quality of the resulting svg is poor. I’ve found the online converter is quick and easy for my needs.