Amazfit Watch faces

I am trying to modify this watch face to have other information on it other than just steps. I want to add battery percentage and heart rate and possibly make a couple of dials. I try to add it to the editor but keep getting an error message saying the .png files are either read-only or damaged.

any help would be greatly appreciated!

watch face link: https://amazfitwatchfaces.com/t-rex/view/11201

u need aplication name AmazFit_Watchface_Editor(without Python) or with if u know how to write code in Python , and then u upload this watchface and u need add new icons and set everythink in edit tab, i mean click checkbox batter percet etc and after this select icon u upolad earlier and pick loaction x,y and that it.

Thank you all, but I am still having issues trying to even get the pic to pull up once i load it into the program.