It is ideal when having an issue with Fusion 360 to upload an *.f3d file. Then we can see not only the image you are working with but all the other choices you have made.
This forum allows the *.dxf file extention .
Exactly the issue I think as well. The geometry is too small.
I’ll run a quickly live stream running the provided file above. A video is worth a million word.
I’ll have to also look of why my file system show that SVG as red ?