I'm trying to email as an attachment to my iPhone a large image from my PC via Gmail. Its original size is 3840 x 1080 pixels (5.57 MB). At first, when I received the image it looked very bad on the phone (for which I blamed the iPhone). But then purely by chance, I had to email a similar image to my PC. After which I realized that the image was badly cropped down to 1280 x 360 pixels when I received it.
Is there a way to make it stop messing with my attachments?