Extra Fields was introduced in Q1 of 2016 to add consistency to the upload process.
Questions and answers may both contain Extra Fields. Activate Extra Fields by clicking the Show Extra Fields button.
From there, follow your nose. You can upload arbitrary files (like layouts) and in a separate section, images.
Extra Fields was brought to reality by Tyler Hebenstreit.
Now! Upload your layouts, pages and presets directly from MIDI Designer Pro 2.