I have the s20 ultra and having nothing but problems with trying to use an external mic. I get similar white noise, but more like static, so when speaking it garbles the sound. I have tried 2 different usb c adapters to head phone jack, Including the Samsung brand. it happens very randomly, I can record a video and no problem it works fine. Then record another right after and thinking it's all good to only find out later is messed up the audio. So frustrating, I have tried 2 different mics, the rode micro and the rode wireless go and same issues with both. When I try these set ups on my S9 phone, no issue at all. I see this topic come up a lot and for some people ot works and others it does not. So I don't know, I have spoke with Samsung tech support and they could not help, they were supposed to get back to me with an answer but that was over a month ago. Samsung has really screwed this up in these new phones with not having a headphone jack. They could have at least tested these with a usb c adapter to for external mics before mass producing them. With most people using their phones as a video camera, the internal mics are terrible for recording a youtube video. This has really made me think about not getting a Samsung phone again.
