Submitting CSV to HMRC

I’m trying to complete my 20/21 tax return with HMRC. I have my capital gains reports from Koinly - One of which is a PDF, which is just summary of numbers I need to put into my tax return, and the other is a CSV for details of all transactions.

The HMRC site says “You must provide a computation for each disposal of an asset which is not exempt from Capital Gains Tax”, which is fine, as, presumably, all the detail is in the CSV I downloaded from Koinly, however, I am only able to attach a PDF to my return. Even if I leave that section of my return, and go right to the end, to the “Any other information” page, it is still only allowing me to attach a PDF.

Do I really have to convert the CSV to a PDF in order to upload it to HMRC, or am I missing something?

Thanks.

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