CSV means comma separated value. All spreadsheets apps like Excel, Numbers and GoogleSheets can export CSV files.
Trouble importing graph values can occur for these reasons:
Corrupted CSV file - CSV files sent via email or chat systems can be corrupted during transmission. Try opening a corrupted file in a spreadsheet app and export to CSV, or request the original spreadsheet file and covert that. Alternatively, using a file transfer service like dropbox or google drive with avoid file corruption.
Incorrect file format - the file type must be CSV.
Incorrect field names - field names are case sensitive, they must appear exactly as shown in Full List of Graph Import Fields
Incorrect data - Values must contain ONLY numbers and decimals points. Remove all commas, currency symbols and letters. (e.g. $2,000.00 is invalid, 2000.00 is valid).
Incorrectly formatted date - Use yyyy-mm-dd, e.g 1st Jannuary 2021 is 2021-01-01
Missing Graph ID - This is a required field.
If you still run into trouble, reach out to support via the chat below.