Cant work out how to add main photo/thumbnail for tv series page

ah landscape

I figured as much. When it comes to all title pages besides episode-type title pages, only images with a portrait width-to-height ratio (lower than 1:1 or ideally near 2:3) are eligible to become a title page's primary image, whereas with episode-type title pages, only images with a landscape width-to-height ratio (higher than 1:1 or ideally near 16:9) are eligible.

(https://community-imdb.sprinklr.com/conversations/data-issues-policy-discussions/no-option-to-change-primary-image-for-a-film/6391375c79ef5d464f7495f1?commentId=6391487479ef5d464f749f32 )