Genuine question, how do u upload on tiktok without it getting compressed to 720p or 540p max?

Before u say something like export the video on 1080p on capcut or adjust the bitrate, etc, I've literally tried every single way/method known to humanity, and nothing works, edge app method, node app, etc. Idk how those editors on tiktok post crisp edits with 1080p in the quality selection tab. I think those editors post on iphone isn't it. Please drop literally any method/way that you know in the comments, ill be happy to try and experiment with all of them!