JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
You can use the "File Upload" tool and turn on the "Allow Multiple". Please check this demo form.
You can also create 12 single File upload tool if you like. Please be reminded to increase the "Max File Size" so that a limit can be set for each upload field.
You can set up an email notification so that you will be notified via email once a new submission arrives.
Let us know if you have any question. Thank you.