It’s confusing, but Ableton ‘MIDI clips’ are not MIDI at all, so drag and drop (and not just to Scaler) won’t work in that way.
Right click and export as MIDI (I normally just drop it on the desk top) and then you will be able to drop that into Scaler.
Be aware also that Ableton doesn’t know what a MIDI channel is.
Also, if you have some MIDI sequence and you drop that into Scaler, note that it does not recognise ‘time’; it senses changes in chords and loads the detected chords into section A. Single notes will be shown as such.
It’s slightly different at first to working with DAW’s, but once you get the hang of it, it is efficient.