You may have to mail the return with all the necessary attachments if the state cannot access the PDF file... Just my opinion

Did you attach it from within the State module or Federal? Attach it within the State Return side.

I did that, and it shows as attached on the state information worksheet, and it shows in the home base view as being attached, but when I try to efile, it says there is an error and I must attach the copy.

When attaching the pdf it defaults to type: other;  then you type a description/form

Try looking at the other choices for type - should be "another state return"  Using that it should recognize that it is attached

Good luck

I just had this problem as well. Remove your attachment and then reattach it but when the pull down list appears for "type" do not click other but instead go all the way to the top where it says "OS Tax Return"

This solved the issue for me and I was able to efile the Wisconsin return

Good luck