Unable to Markup Office files with the SmarTeam Viewer.
There is a setting for this that needs to be enabled.
Markups for Office Documents:
In order to enable Markups on Microsoft Office documents in
the SmarTeam Viewer you need to set this option in the avx.ini under the
[Options] section:
EnableOfficeMarkups=1
The avx.ini file exists in the C:\WINDOWS directory.