On the contrary, this is exactly how it works. The biggest pain point in sharing high quality photo or video content in 2021 is that every single service insists on quietly compressing or transcoding your content. Some, like iMessage, even do it inconsistently depending on things like current format and file size. To make matters worse, Gmail, iMessage, and friends will often show you, the sender, the original quality, so you don't even know that the content has been butchered.