Ask HN: Optimal video render settings for Instagram uploads?

I'm developing a video editing app for iOS and have faced an issue with video quality on Instagram. While exported videos play with high quality on my video player, uploading these same videos to Instagram (including Stories and Reels) leads to a significant loss in quality.

Does anyone have recommendations for the most effective render settings to maintain video quality on Instagram? I'm looking for insights on codec, file format, resolution, frame rate, bitrate, audio settings, etc.