Importing multiple files prevents downloading

[jerrywham]

When organizing multiple documents, the pdf generated is the name of the joinder of all imported file names. This produces an error when there are more than 5/6 imported files because the final name is in the form: file1-file2-file3-file4-file5.pdf
If the names are long, the final name will be all the longer and it will trigger an issue.

The final file should have a generic name like "document.pdf".