At the time of writing, Gamma currently supports the following file types for collections listed on our marketplace or deployed using our Creators Self Service Portal.
We plan to soon support music-based (audio-only) NFTs with a cover image in an accepted image format, but this is currently not available using our Self Service Portal. If you have this use case, please reach out and we can assist. The current workaround for these cases would be to upload MP4 files containing your music alongside a visual identity.
If there are specific file types in your collection that differ from those listed above, please contact us to discuss whether we can add support for your collection's file type.