Doesn't convert in iOS 10+ Mail – Plain Text Paste Review

The clipboard contents (YouTube URL) shows up in the app, but when I copy and paste it into an e-mail message, the server rejects it as multiparty/converted content. Any ideas? 09/15/2017 Still does not allow me to paste text into the e-mail app as plain text. Still getting the same error from the server. I guess it's time to give up on it. Nice try, though.
Review by tom7601 on Plain Text Paste.