It listed my LXR-02 (connected over usb/web midi) as "Supported" after I connected it, but it did not appear in the list of synths under "backup my synth", nor did "capture soundbank" do anything.

Speaking of the LXR-02, I just just finished this MIDI/patch editor: https://lxr02.greg.technology/ (free of course) - source code link in the footer