No video, yes OSD; means there must be something wrong pre-OSD chip. The VTX is working, the OSD is working, the goggles are working, so it must be a camera-side issue.
Links:
OTG FPV reciever: https://www.amazon.com/SKYDROID-Receiver-Antenna-Android-Monitor/dp/B07Q7PTJ1P/ref=sr_1_3?dchild=1&keywords=otg%2Bfpv&qid=1603640217&sr=8-3&th=1
