How to send official sponsorship letters to an overseas embassy via fax?

Hello! Visa processing centers can be strict about accepting paperwork through official channels. When I had to submit supporting papers last year, I found a detailed write-up over at https://how-to-send-an-international-fax.com/ explaining how to fax overseas directly from a mobile device. After reviewing the guide, I chose Municorn Fax App. I just snapped a clear photo of the signed sponsorship letter, entered the embassy's number, and sent it off.