How to "sign and return" PDF received by email or iPhone

Please sign and seal the paper and return it … When you receive such a request, you used to use fax, but you can print what you received as digital data on paper, sign it, and then fax it. It's really inefficient to do. Now that paperless is being screamed, I want to stay digital. In the case of iPhone, the "sign and return" is completed only with the mail application.


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