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The guides at https://www.manager.io/guides/9240 no longer display the column format as explained by @Lubos, because Importing Bank Statements with Reverse Values - #9 by lubos
Below is an example of column headings of CSV (comma delimited files) that work with the Manager import function:
Column headings are: Date, Reference, Payee, Description and Amount
You can now also import where Amount column does not exist but a Credit and a Debit column, i.e.
Date, Reference, Payee, Description, Debit and Credit.
Note that you should not have column totals.