Last time I looked Manager supported
*.940, *.camt530, *.csv, *.iif, *.ofx, *.qbo, *.qfx, *.qif, *.sta, *.swi, *.xml
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*.qfx & *.qif = Quicken file format
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*.iif & *.qbo = Quickbooks file format
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*.ofx = Open Financial Exchange developed by Microsoft, Intuit and CheckFree. qfx is a proprietary variant of ofx
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*.940 or *.sta = inter-bank SWIFT communication standard
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*.camt530 = ISO 20022
So have you tried all the structured file formats your bank offers you fist? It’s easy to do, just download transactions in a period of interest in all of the formats your bank offers then try each in turn.
If none actually work .cvs is the backup option however that is a very imprecise standard so you will need to edit the bank supplied format to convert it to the exact format required by Manger