Unresponsive black screen when I use continuity markup.

When I click on the annotate button, my iPad responds with a unresponsive black screen, a grey bar at top with "Done" and the tools (pencil, eraser, etc). The tools respond to my apple pencil, but do not do anything to the black screen - nothing shows up on the iPad screen nor the document on my computer. Clicking "Done" on the iPad will exit out of the continuity markup, which tells me that the connection is made at the very least. Consistent with that is the fact that I can add a sketch from my iPad when not using the markup mode in a document. I've tried multiple PDF files and image files, but all have had the black screen issue.