Form 8453 is the IRS form to use when sending required paper forms to the IRS. If you are unable to condense your 1099-B pdf file to a size compatible with uploading into TurboTax, then you will check the 8949 box on Form 8453 when mailing your 1099-B to the IRS.
Without prior authorization, the IRS will likely not accept your storage device for safety reasons. Given the number of pages of your 1099-B, its worthwhile to pursue every avenue including getting pre-authorization to submit your date via a storage device in addition to trying to condense the file size of the document.
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