First of all, great app you have there.
I tried to use PDF annotations, honestly, I’ve never used annotations for PDFs, but the implementation seems broken.
I click on Annotate, create an icon in my PDF and yellow rectangle appears on the left. I input text to Annotations panel. After that I create another annotation on the same page and my first annotation’s text disappears. When I try writing text in Annotations panel for the new annotation text is typed into both yellow rectangles for both annotations ><
This definitely looks broken.