I want to record from our band’s mixer to my iPhone 8. I connected the rca outs on the mixer (Behringer Eurorack Pro RX1202 FX) to an adaptor that has an 3.5mm plug on the other side. I then used the adaptor that came with my iPhone 8 that takes that plug and adapts it to a lightning plug so that I can just plug directly into my iPhone. But the iPhone doesn't seem to recognize that as an input and only records using the mic, which I don't want. I have read the the Apple adaptor has an analog-to-digital converter, so it can't be that the iPhone doesn't recognize the analog signal. Any idea how I can do this? Do I need another device and why? Thanks for whatever help you can provide!