Optional ReadonlyaltThe alt text of the media (custom_accessibility_caption).
Optional ReadonlycaptionOptional ReadonlycoauthorsThe accounts invited to co-author the post (invite_coauthor_user_ids, with internal_features: 'coauthor_post').
Optional ReadonlydisableOptional ReadonlyhideOptional ReadonlylocationOptional ReadonlyproductProducts tagged in a media (product_tags, { in: [...] }), placed like usertags.
Optional ReadonlyusertagsPeople tagged in a media (usertags, { in: [...] }): on a single photo the post's, in a carousel each child's.
What the person decides on the "New post" screen besides the caption: the screen's own options, kept whole from the posting bricks the screens replace so no action of the library is dropped. Only the caption is modelled on the 451 build; the rest carry the wire the removed
TimelinePhotoPost/AlbumPostsent (tagging a person, coauthors, product tags, a location and the advanced settings are not modelled on 451 yet).A carousel's tags and product tags belong to its children (
AlbumPhotoUploadput them there); a single photo carries them at the top level.