I have performed the conversion with a sample DXF file and provided two different tutorials (no sound):
Note: DXF is unit-less, so during the conversion I assumed the DXF units were "millimeter".
Note: All gerber results were viewed in our free viewer called "DFM Now".
1. Perform Join and De-embedding.
2. Create a separate layer for border layer in the DXF:
Lastly, here's our recommended guidelines for converting DXF files: