I'm using Civi 5.18.3 on a demo site. I am trying to add the text of a Twitter bio as a new Note for a Contact, and it is not saving. The bio text contains these characters:
National Volunteer & Distributed Organizing Manager for @WorkingFamilies . #WFP4theMany @ http://WFP4theMany.org & http://WFP2020.org RT ≠ endorsement. 📣TEXT WFP TO 738674
The User Guide doc page here does not specify if Notes must be only plain text characters.