M300 RTK Onboard FPV Camera and Network RTK

Hello! I am working on utilizing a DJI M300 RTK drone for use with the Dronelink planning software. I am working for a university, and we are planning on purchasing a Professional Growth plan for now, and potentially expanding in the future. I have a few questions regarding compatibility. Under a professional growth plan, M300 RTK, Smart Controller, modern iPad connected for dronelink, am I able to utilize network RTK, or is this only possible with the DJI RC Plus? RC Plus 2? Etc...? Additionally, as an initial test, I utilized my personal account (the one I'm making this post from) to attempt a connection between the dronelink running on an iPad and the M300. I was able to connect successfully, and enter the aircraft dashboard (could see satellite information, etc) but the camera view was blank, and there were messages stating the camera was disconnected. We are flying with a custom payload, and as such we have no mounted camera other than the onboard FPV camera. Is the FPV camera not supported, or is this simply because it wasn't on a professional growth plan? Thank you!!