No, it does not go on Schedule C.
If this is a Community Property State and you are choosing to treat this multi-member LLC as "disregarded", the 1099-B should be in YOUR and and Social Security Number, not the name of and EIN of the LLC.
If this is not in a Community Property state or you are not choosing to treat the LLC as "disregarded", it needs to be reported on a separate Partnership return (Form 1065).
At any rate, if the program does not import it, you will need to manually enter things. No, the program does not let you attach a PDF, but in some cases (such as when all of the Basis is reported on the 1099-B and there are no Wash Sales), you don't need to provide all of the transactions. See "exception" in the Instruction to Form 8949.
https://www.irs.gov/pub/irs-pdf/i8949.pdf#page=3
