Im not sure what the instructions say, but its the making a copy of the file that seems to trip people up.

I dont save any computer copy of the original, its wrong so I have no use for it anymore within the program...I keep a printed or PDF copy of it and thats it.

I just open the originally filed return and activate the 1040X by entering the year at teh top, then I check the EF 1040X on the fed info worksheet then make any changes...I havent had any issues Efiling an amended return.