Update 10.4: my PDF attachemets opens ONLY in the native internal reader, without the possibility to choose my phone apps!!! This are exactly the same problems that I had reviewed for the beta app August 2020.For moment, I will revert to an old version (which is way better than this appalling update).One star, hope for better very soon. Update 10.28: The problem still remains: PDF attachment open ONLY in the native internal reader, without the possibility to choose my prefered app. still 1 star.