[Zubersoft]

It's really strange you are encountering those issues. Annotating with the S-Pen is normally quite straightforward. I have a Samsung Tab S4 and the S8 Ultra each with a different model S-Pen, and I've never encountered anything like you are describing. If you go into the annotation settings, can you verify that you have turned "Stylus Mode" off? Can you use the stylus to tap things on the library screen? 

Mike