themeconfigurator module changes my orginal file properies

[alirezaok 0]

hi

I use of default perestashop theme

in  module > themeconfigurator at where that I can change pictures of Home posation, top posation and .... , I cretaed pictures of this posation with jpg format and special size.

when I change these pictures and Upload it, the format of my orginal files (jpg with specail size) change to png file with another size.

I want to upload and presetashop use of my exactly file properis and not changed size and format of it.

anyone may help me?

thanks

[alirezaok 0]

any idea?