Especially on the 11" and 12,9" iPad Pros Split View makes sense to open IDMA and another App Mail or Verse for example side by side.
In that case Drag & Drop would be great to drag a attachement from the Mail app or an Image from the Photo app to an IDMA Richtextfield.
Enabling Split View Support should be an Low Hanging Fruit
What is Spilt View:
posted by Detlev Poettgen - midpoints