@BhumaL  I am unable to attach a pdf in the PS23 Federal 1040 module.  I am able to attach a pdf in the PS23 Iowa module for the same client.

The result is the same, the pdf fails to attach from within the open client return and it fails from the EF Center.  

Upon further testing I am NOT able to attach a pdf to other clients returns in the PS23 Federal 1040 module.