You can convert your excel file to csv using the instructions that @AmyC has included above.
You can also tell the program that you are going to submit the transactions as an attachment and then when you have finished filing the system will generate a form for you as well as instructions for mailing in your spreadsheet.
You may want to wait until you have received the 1099-B for your transactions before finalizing your return. Most crypto transactions are required to be reported to you and the IRS on that form now so you should make sure that it matches your spreadsheet as well as being able to submit the 1099-B to the IRS with the 8453 instead of your spreadsheet.
@rebateme
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