I know Facebook pages have the ability for admins to disable photos in comments which says to do so by disabling photo/video posts to a page's timeline (which seems counter-intuitive, but I digress).
However, there appears to be no way to enable or disable photos in comments on personal posts (comments for profile posts or album photos not associated with a page).
Seems like it can be done though, because I have friends with personal posts to which I cannot attach a photo in the comments. One friend, in particular, isn't sure how it happened, but wants to re-enable that ability and neither of us can figure out how. Everyone seems stumped according to my Google search, and Facebook's support system is littered with people asking the same question but never getting any answers.