Thanks for reaching out @mercedesthetrainnl. It sounds like what you’re asking is to add an additional field on the volunteer sign up form so volunteers can upload a CSV file when they sign up. Is that right? If so, there unfortunately isn’t an example we have of adding an additional field. You can do this, but it requires a decent amount of technical knowledge. If you or a developer are comfortable with programming, take a look at the template at templates/opp-single-form.php. It can be copied into your theme and adjusted. You’ll then need to use WordPress hooks to save the form submission’s new field.
Good luck and let me know if you have any other questions.
Jonathan
Wired Impact
Since we haven’t heard from you in a little while I’m going to mark this as resolved. Of course, if you have any questions in the future don’t hesitate to reach out.
Jonathan