Iphone videos do not work with CUDA
When you upload iPhone (either vertical or horizontal) videos to a project in PP, with CUDA turned on it will not show the video thumbnails on the timeline. When you render it out, you get only the audio and not the audio and the video. In order to preview your edits, you have to turn off CUDA (software only). But in doing this, it completely slows down the overall edition process (since you're not able to use our $1,000 NVIDIA graphics card). Plus, when you turn off Cuda, you lose all of your renders meaning you have to render the whole timeline AGAIN. I have noticed this with videos that have come from my iPhone 11 when I use it on my DJI OSMO Mobile 3 or my DJI Air 2S drone as well.