When I was doing the mentioned level I was confused by there being 8 photos and 4 pdfs. The instructions say:
>Upload the image again and the matching article PDF from the Library
So I was expecting 8 and 8 each. Instead there is one article about fashion with 4 matching pictures and one article about logging with 2 matching pictures.
I feel like the instructions should say something like choose the article that best matches the picture you chose in step 1.
A further refinement would be to change the file names of the PDF files to be logging, ride share, fashion and audience such that the match is obvious.