I have just completed a brief workflow on Bookends iPad OS.
* Open a PDF in BE iPadOS, and open it to annotation mode
* Open a split view window with something that can Share to the COPY function as an image (in my case, I was using GeoGebra iPadOS to create a graph of a function in the publication)
* Share the result from the split view window using the COPY option
* Return to BE iPadOS, select and hold on a region on the PDF, and PASTE
--> the image from the split view is pasted onto the PDF page
You can add an annotation note to the image. You can move and resize the image. I expect the image to export through Highlights macOS to .textbundle to markdown to Obsidian.
I appreciate and applaud the developments for the annotation tools in BE iPadOS that made this process seamless.
Thank you!!