GL.iNet routers do not reliably support third-party USB WIFI adapters. Their engineers design firmware with only pre-tested WIFI devices in mind, and adding new adapters often breaks their scripts. Even when a USB WIFI adapter works with the current GL.iNet firmware, a future update will likely break it
Years ago I made a request for better support of USB WIFI adapters. Did not go far.
If you are trying to add USB WIFI adapters to a router, you are normally better off ditching the GL.iNet firmware and running generic OpenWRT.