+1 for improving eink device experience. I also have an onyx boox lumi 2. And, for me, the problem is some converting work paperpile’s web pdf viewer does on the handwritten annotation I draw in the eink device. After the conversion, the annotations are gibberish and highly simplified on all other pdf viewers like pdf expert and the one in lumi 2. And the android app is not really optimized for eink notebook. It would be nice to have an option in the future to disable the annoying conversion.
a related topic, the gibberish annotations: All of the issues with hand written annotation of PDFs