In the most recent update, it says that an "add to setlist button" was added to the song edit page, as well as an "add to song" button when editing midi presets.
I can see the "add to song" button for Midi presets, but not the button for "add to setlist".
Do you have the new Settings > General > Interface Level set to Simplified? That would hide the Add To Set List button on the song edit page.
I do. I didn't realize that, especially since the "add to song" button for midi presets appears. Is that intentional? I feel like that button should appear in both views
Yes, it was intentional. The song edit page is more commonly used and is longer and people sometimes complain about too many options there. Nobody has ever complained that there are too many options on the MIDI preset edit page.