Is it possible for photo's to be uploaded to a form? I would like to create a form for competition entries. However, there needs to be the option for entrants to upload pictures with their entry form, is this possible? 

Many thanks
As mentioned in Oli's comment, there's an example of how to do this in the documentation: https://docs.craftcms.com/v3/assets-fields.html#uploading-files-from-front-end-entry-forms