PollUnit offers you different possibilities to request any information. The caption, which can optionally be hidden, is a standard field. You can also request a subtitle and link. This information is visible for all participants in the photo contest and can be activated in the first step when creating the contest.
In step 4 »Advanced« you can define any fields that your participants have to fill in optionally or mandatory. This information is only visible to administrators. PollUnit distinguishes between voting participants and participants, who submit photos. The additional fields can be defined per group.