I'm kind of at the end of my rope here. I exported some files off my iPhone (taken in Filmic Pro). They are 4k video files at 24 fps. When I import the files into Premiere Pro, I only get the audio file (no video). Encoding directly in Media Encoder under the default settings (and some obvious alternative presets to try) results in an mp4 file which plays audio only file (with black video).
Any ideas what is going on, and how to fix? Other videos from my iPhone seem to import just fine.