Thanks for reaching out to us, Mike.
So permission levels work when folders are shared to other users. You need to first have the folders created on the group admin account, and then share these with your users so when they map drives to the folders, they will be able to see those contents. Obviously they will not be able to see anything that you have not shared with them.
I believe where you are getting stuck might be due to the fact that you are trying to do all this within the mapped drive environment. Drive Mapping is meant only as a transfer tool. You cannot share, publish, or create users under a mapped drive. So, you will either need to logon through the website or us our FileManager software so that you can physically share the folders with your users. Once the folders are shared to them, the folders will appear under 'DriveHQ Share'.
Here is a link to the shared topic within our service manual if you are looking for step-by-step instructions: https://www.drivehq.com/servicemanual.aspx#_Toc265186664