Can I attach a pdf copy of 8949 form and statement explaining differences and adjustments between from 8949 and 1099-B with e-file

I have washed sales from stocks to report. I am using tradeLog software to generate the 8949 form. According to instructions on their website, 

 

https://support.tradelogsoftware.com/hc/en-us/articles/[phone number removed]

 

They suggest to generate form 8453 and mail a copy of the 8949 form along with statement explaining differences and adjustments from 8949 and 1099-B forms. 

 

Instead is their a way to attach the PDF copies of these when we e-file? is this acceptable or we have to print and mail the copies along with 8453 form?