In order to import MT940 files into Exact Online, you first need to add an additional bank account in Exact Online. This account represent the outstanding balance with Mollie.
Add a new bank account from the financial cockpit
To do this, you have to create a new general ledger number. Fill out the account number NL30 ABNA 0524 5909 58. This number is also listed in the MT940 files and tells Exact Online which account the MT940 files belong to.
Now you can use Import statements in the financial cockpit to import the MT940 files.
Did you set up an automatic bank link in Exact Online? In that case, it is no longer possible to manually import MT940 files. Please contact the Exact Online support desk regarding this issue.