sha_sha500

Hi I upload a picture to my cache page, and because it is a puzzle I added information to the picture that the solver needs to find. Apparently, during the uploading to the server, the file is changed and the details I added to the image are deleted. I tried both png and jpg and the result is the same, the image is uploaded without the information I added. Is there a way to solve the matter other than uploading the image to another server and adding a link? Thanks