When e-filing, what is the maximum file size that you can send to the IRS?

My form 8949 consists of many, many pages, and my broker (Coinbase) didn't give me a 1099. I was hoping I could just e-file it. All of this is short term capital income from cryptocurrency. I am filing with a CPA as well, so I plan to just give him the form 8949, if that is even possible.