It doesn't work for me in my InkPad 3 and the PocketBook support told me:
"At the moment, the function of transferring notes and highlights to the PC is temporarily disabled. We expect this possibility to be implemented in one of the next software versions. Unfortunately, the information about the date is not available at the moment."
It might help if you also drop them an email requesting this feature at
help@pocketbook-int.com.