When you upload a photo for a TV Show, you have to enter the season number and the episode number like this for example :
So, when you upload a photo for a promoshoot of a TV Show, it is almost the same. You have to enter the season number and the shoot number (instead of entering the episode number, you enter the shoot number with a "-" before the number to differentiate it from an episode number). For example, if you want to upload a photo for the shoot 2 of "Jessica Jones", it goes like this :
Please, try to enter these informations as much as possible.