I thought I had figured this out but maybe I'm missing something.

I installed the module 'Uploader' and want to be able to grant access to spcifics users instead of making access site wide.

I created a group called 'Uploaders' where the only item that is checked is access to the module itself. I turned off access to the module for the other groups.

I added myself to the Uploader group but still didn't see the module appear in the Main Menu.

I thought that if a person was a member of multiple groups, they would gain access to everything that all the groups gave access to.