Downloaded PDF won't open

I had set up a map to a PDF file and successfully downloaded it as well as emailed it as an attachment. Today I had to create a new map to an updated PDF file. I deleted the old map and file, and I can successfully view the file using the EXPORT to PDF button in PRO2PDF Export tab. However, the downloaded file from my form cannot be opened and I haven’t received the emails subsequent to my changes. I do notice that somehow yesterday I was able to set the default file name to “Vendor Contract.pdf” and today it is saving them as “Form.pdf” – I cannot find where I set that name yesterday.

I am very inexperienced with WordPress so hope it is some easy change I made to either the mapper or the form that is causing problems.