Your software
My Mautic version is: v3.1.2
My PHP version is: 7.3.27
My Database type and version is: mysqlnd 5.0.12-dev
Your problem
My problem is: I am trying to upload a .csv file to a segment that I created and am receiving the following error: “The file is not encoded correctly into UTF-8.”
Try opening the .csv file in Excel (Windows) or Numbers (Mac) and if everything looks in order and good then export it again into .csv to see if that fixes it.