I'm trying to set my mail signature in the mobile app to shows the same as the desktop version but is not working. I set up everything correctly in the desktop version and everything works correctly. In the mobile phone the desktop signature is set up correctly as well but doesn't show anything in the preview and mail goes out withiut signature. The only thing that is not clear is that in the desktop version there is a broken image in the preview and that could be an issue for the mobile(img attached) that can't read the signature.

Could you advise me please?