What browser are you using? And, how are you approaching the Safe Image process?
However, I do know that from a PC/Laptop: Be sure image is in view mode, or opened in a new tab (DO NOT try to download from the Attachment). Right click on the image. Scroll down, and Left click on Save image as:, Either rename the file, then, OR click on the Save button
Sorry, I do not download from my Android phone. So, I am not certain of the process.