I have tested with 4 PDF documents on both the Boox and the smartphone. Nothing is working: highlight, underline, free hand, nothing!
I first noticed it on the Boox, then tested on the phone before updating and it was working fine and quickly, but after updating everything stoped to work.
All tools work fine on the Boox if I use my fingers, but not with the pen.
On the smartphone nothing works, nor the fingers or the pen.
I remember that something similar happened earlier this year.
I have also noticed that sync is *very* slow. Annotations made with my finger on the Boox are not yet appearing on the smartphone after some 5-10 minutes.
Upgrade Storage
Can you try several files on both e-ink device and regular device?
I first noticed it on the Boox, then tested on the phone before updating and it was working fine and quickly, but after updating everything stoped to work.
I am sorry, I have no epub document to test.
On the smartphone nothing works, nor the fingers or the pen.
I remember that something similar happened earlier this year.
I have also noticed that sync is *very* slow. Annotations made with my finger on the Boox are not yet appearing on the smartphone after some 5-10 minutes.