import and export word files with edits / underline in Word

Hi, I just bought Boox Tab Ultra.

I have two problems:

First problem:

- I import a word file via cable from my PC into the Boox Tab Ultra documents folder.

- I underline on documents with my finger.

- I save and close the files.

- then I import them from Boox Tab Ultra on my PC, I open them and you don't see the changes (underscores).

How can I do?

Second problem:

- I would like to use word (or pdf) files mainly to edit and underline (or highlight) them.

- I would need to underline with the pen but obtain the same result as if I underlined with my finger (ie straight lines that are read in a word file).

How can I do?

Thank you

Albert