I have a LG V10 phone. In trying to connect with my drone, I accidentally connected to the drone under an "Inspire" drone. On the "Inspire" drone the Camera button is there. I have tried to connect on the Phantom 3 standard, but it won't link since it has already linked with the "Inspire". I have uninstalled the app, looked for any and all folders that said DJI and deleted them, and set my settings to not restore settings when reinstalling apps.
Every time I reinstall the app, the Inspire has the camera button.
How do I unlink under Inspire so I can redo the link under the Phantom 3 Standard?

Not 100%, but try this. Before doing the uninstall look for data and/or cache delete in the app settings, then do the uninstall.

Another thing you can try is forgetting the Standard's WiFi and then refresh/ reconnect to ensure that the device is properly connecting to the aircraft.