If you download the plugin by clicking the GitHub download button and don't rename the plugin folder before activating, the submenus won't show up, which can be pretty annoying. I used a fixed slug for the menu so that it can work with any directory name.
If you download the plugin by clicking the GitHub download button and don't rename the plugin folder before activating, the submenus won't show up, which can be pretty annoying. I used a fixed slug for the menu so that it can work with any directory name.