IMPORTANT: If you have made any swaps on the exchange, you WILL need to go into the excel file, and manually add the amount that was sold as an additional column (I).
For example, this exchange of 3500 NEXO to ETH:

NXASVASCQhc

Exchange

NEXONEXO/ETH

ETH 2.009105

$8,828

approved / Exchange NEXO Token to Ether

$1,234.56

2021-12-01 10:10:10

You will NEED to add a column to the right of it, column (I) and enter the exact amount of asset you used for the swap, as for some reason the exporter doesn't do this automatically. So a fixed example of the above, 3500 Nexo to ETH, would be:

NXASVASCQhc

Exchange

NEXONEXO/ETH

ETH 2.009105

$8,828

approved / Exchange NEXO Token to Ether

$1,234.56

2021-12-01 10:10:10

3500

The above manual fix needs to be done for ALL rows where the TYPE is "Exchange"

Nexo.how does NOT save the file or use it for anything, the file is only uploaded for processing on the nexo.how server, and not saved.

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Select file and upload it, it will parse it, fix the formatting and then send you the fixed version immediately for download.

UPDATE 03/03/2022: NEXO has updated their CSV exporting and broken this tool. I haven't had a moment to test and update the script, please check back in a few days, sorry for the delay.