I am trying to download a PDF, but I'm unsuccessful. I can use the 'download file' command to save a file that ends up being a PDF, but when I try to open it, I get an error saying the file is not a valid PDF. On the dialog to save the file for the download file command, I can name the file and choose where to save it, but I cannot specify that it should be saved as a PDF file type in the file type dropdown. Is there a problem with mime types, or am I doing something wrong? I would appreciate instructions about how to save a PDF from within the adobe helper window that controls the brows