Convert CSVs to Koinly Format

I have two CSV exports from the Gate.io crypto exchange that refuse to upload to my Koinly tax account. I know the column headers and data order need to match Koinly’s template, but after trying the YouTube guides I still run into import errors... (Budget: £20 - £250 GBP, Jobs: Data Analysis, Data Entry, Data Integration, Data Management, Excel, Microsoft Access, PHP, Visual Basic)