You mean Apple phones can't sign the signature field sent by the other party. What should I do? You can ask the other party to send it again, or add your signature with a photo folder.

Signing your name in the signature column means that you have to bear some responsibilities, so if you sign it, you'd better read the agreement in person and sign it for confirmation. If it is not convenient to sign on site, you can sign remotely. When the signature column can't be signed, you can ask the other party to resend it, or you can add fonts and write your own name in the picture editor.