Hey there,
I use the Ricoh Theta V paired to my iPhone while also bluetooth pairing a GPS to my phone. I’m using a Trimble R1 and the Trimble “GNSS Status” App on my phone. I have to select the GPS as the phone’s location provider in the Trimble app and leave the app open in the background. I’ve found that I also have to have the Theta app open and on the shooting screen for the coordinates to be recorded. If I minimize the app or just have it running in the background, the coordinates are not recorded in the photos.