Very nice work. I'll definitely play around with it. For the use case of a digital lab notebook, it would be nice to be able to annotate (superimpose drawings, highlight, etc.) images and pdfs directly in the editor. This would be even more powerful if such annotations could be grouped or locked, so that their position relative to the annotated image remains fixed. This is something that all other note taking apps either miss entirely or implement poorly (or maybe there's something else out there that does this well?). Is this possible in Stempad, or are you considering adding such functionality?