How to import midi files, but in Linux, and just get sound?

I have FluidSynth installed. I know Renoise knows it exists because I can see that in the console output. But it doesn’t show up in the midi devices in the Load File With Options menu. When I load the midi file, I get a bunch of blank tracks with no note data. There are blank midi instruments and I assigned presets to them but I don’t get any sounds when I press play because there is no note data.

How do I get note data to import?