Whtat is the reason of low quality of photo when uploaded to app?

possible helper
When uploading an image to the opening screen of the Zaffan application, the image decreases in quality and pixels
What are the appropriate dimensions for the image
The first problem is in the format


Is the image placed in the screen background ?

This is a known issue

Image placed on a virtual screen

Do you mean as a background image to a vertical arrangement ?

(If so, the same applies as above)