1. Form 8453 (with the required forms or supporting documents) must be mailed to the IRS within three business days after receiving acknowledgement that the return was accepted. An electronically-transmitted return will not be considered complete until a Form 8453 is received by the IRS.

2. Delete no longer used pdfs on the amended return. 

Really? Wow! So, what is the point of attaching pdfs if I have to print them out and send anyway?

One was a 1200+ page Brokerage document with lots of wash sale loss. Do I need to print out all sheets, or would a summary be enough?  

Perhaps I just send in the form, not the huge attachment?

i never attach a 1099.. i report dividends, interest, etc and totals for capital gains and losses.

I generally don't either, but this was an exception due to the shear number of Wash Sale transactions. 

Sounds like you inadvertently triggered 8453, when 8979 Practitioner PIN should apply. When the 8879 is used, the attachments go with the return and no paper mailing required.

Interesting.  The 8979 was used.  Thanks