The author of a photo uploaded to their gallery can now specify their role in creating it and invite other users as co-authors. For example, a photographer can invite the model. If the co-author accepts the invitation, the photo will appear in their gallery and they will be able to submit it to contests. The original author can revoke co-authorship, but only if the co-author has not placed in the top of any contest with that photo. The co-author can withdraw from co-authorship at any time, in which case any trophy won by the photo will transfer to the remaining author.