Also, in the page file, the picture automatically gets duplicated in several files with @2x, @3x@4x.. in its name. Does it have something to do with it ?
Am I uploading wrong pictures? Should I resize them before?
Hello @pamtbaau both questions are related. I was just suggesting a clue.
A friend helped me, we changed the limit of the size for the file, went to .png, reduced the quality and it seems like working now!
Thank you for your help