I'm trying to post a CSV to ArcGIS Online from "Content", "New item" and it's giving me an error: "Error while analyzing file" like in the attached image. There are eight fields in this CSV and no repeat names nor any spaces nor characters other than underscore (_). There are 12 records in the CSV, nothing odd there standing out either. I've tried adding slightly modified tables as well but same generic error message. This issue started yesterday. I have been able to add CSVs previously.
Does anyone know what can be done?