adjust your csv files so the columns are in the same order as on Form 8949.
Put a header with your name year 2019 and SS Number
Use the summary option and then you can mail in the printout of the CSV files.
You would use Category C and/or F since you don't have a 1099-B.
At tax time, you have the option to summarize your transactions by Sales Category.
IRS requires details to be listed on Form 8949,
or on your own forms (e.g. consolidated 1099-B) which have the same information and in the same manner as Form 8949.
Either way, if you choose to summarize, you have to mail the transaction details to the IRS within three business days of IRS accepting your e-Filed tax return.
