iOS App Photo Upload Quality

Hi,

Today I realized that photos on Nextcloud uploaded from my iPhone are worse on quality than on iPhone. I’m using jpeg compatibility mode because I use Linux and can’t see heic formats easily.

Is there a way to upload photos with full quality?

This is interesting question. It’s been discussed earlier, but I can’t remember if there was a solution.
How clearly you can see that it’s worse quality?

I can clearly see the difference in colors and compression when zoomed-in. But colors are not acceptable