First... why do you want to do that or think that it is necessary?
edit... based on reviewing your other post - I'm 'guessing' you want to attach details of a one-to-four properties 1031 exchange. Screen 4.1, down to e-file PDF/Miscellaneous (left side, last one). Click the 'button' that says PDF Attachment, then the one 'Attach PDF'. Browse to where the file is on your computer.
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