You now have the ability to add additional fields to your template which allows you to upload files to that new report.
In the form select FILE in the field type dropdown box - Administrative rights required to edit and create new forms.
When the user creates a new report, they will have the ability to upload a file to be attached to the report.
Please note that deleting old fields in existing forms is not a good idea as the information on older (previous) reports created will now exclude the field that has been deleted.
When a field is renamed this new title will appear in all older reports. Rather create a new template and inform your users to use the new form.