Video iphone 12 pro max low quality on Instagram tiktok

Hi everybody,

I just got the iPhone 12 pro max and went out to try it, the videos were great but when I tried to upload them on TikTok, it’s so low quality, the colours change.... and on instagram it’s laggy ... low quality too, I read another topic that we need to deactivate the HDR, I didn’t try it yet .. but then what’s even the point of having the HDR and we can’t use it on any app ??? That just make the iphone 12 pro useless

I need to take a decision soon if I should return it ( my IPhone X were GREAT)

I’m surprised that no one talks about it, this should be a NO for everyone

is there anyone who’s experiencing the same thing ?

thanks