After I select a cryptocurrency service like CryptoTrader.Tax, I'm still directed to entering transactions manually. I can't find a way to upload my trades in a CSV file.
You might be best advised to contact Support (via the link below) at this point.
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
A CVS file cannot be imported ...
Your brokerage statements should include a summary of your transactions, grouped by sales category, for example "Box A short-term covered" or "Box D long-term covered". You'll enter the summary info instead of each individual transaction.
When you are done entering all your sales transactions, you'll eventually come to the Here's the investment sales info we have so far screen. Here you can edit, delete, or enter more sales.