I show how to install the free version, pick the right settings for 4K (3840x2160), and choose the MP4 H.264 format. After converting, I go into YouTube Studio and upload the new 4K file. This helps ...

If you try to upload a 4K movie directly from Photos in iOS, it automatically drops down the quality to standard definition. To get around this, you just need to use iMovie instead. For whatever ...