Question

I've created a 4:4 1 bar in S1 featuring some 'complex' tuplets.

Notion is not able to understand them . I wonder whether this is a bug or it's just a limitation of the Notion software.

I tried to import the midi file in a different notation software and it is fully understood as it should.

Answer 1

Try going into File>Preferences>MIDI Import and select the option for tuplets.  You will also want to try de-selecting the option for multi-voice as this can interfere with tuplets.  Finally, see if you can adjust the chord looseness in the event that your tuplets are being converted to chords.