Audacity 3.0.0 - local Manual

Ubuntu 20.04 focal/x86-64
Audacity 3.0.0
Installed from Snapstore (Audacity latest/candidate)

The install does not include the Manual, so I downloaded it to my desktop. Audacity Wiki says it is normally placed in /usr/share/audacity, or possibly /usr/local/share/audacity. I have sudo unzipped to both locations but the help button cannot find either, even though my preferences setting is ‘local’.
Should I install it somewhere else, or can you tell me which file to edit to enable audacity to find it?

Thanks. Roger