Hi, so I render videos for multiple platforms. It sure is inconveniant having to render multiple times, or to convert files, just to work for other platforms.

With that noted, I'd like to be able to render 4K videos that work on Instagram, but thus far haven't been able to get it to work.

I've tried the following settings
- Intel HEVC default

- Sony XAVC S Long defaul

- MainConcept AVC/AAC Internet HD (1080) with customed frame size of 3840 X 2160.

I then upload these files to my iPhone 6S, but the phone (and IG) say they're an unsupported file format. Is there any way to render 4K that'll work?