ArcGIS Online does not allow you to create an item that is a link to content on an FTP server. It insists on adding "http://" to the beginning of your FTP link. FTP links should be allowed.
I apologize for not looking to see if this has already been submitted, which it has. Please see https://community.esri.com/ideas/7556
FTP is a valid and useful protocol. All modern browsers and many governments utilize the service. Limiting FTP has forced me to expand the size of my web server to accommodate a file repository for linked items.
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