Is it possible to ask users to upload a photo?

I would like to create a form where I ask users to upload a photo. Is this a function in JotForm somehow?

Yes. We have a file upload element available.

Here is the guide on how to create a form with File Upload.

https://www.jotform.com/help/332-How-to-Create-File-Upload-Forms

Let us know if you need more help.