How Do I Delete Photos From Group?

At the top right of photo posts on a group wall, there is a down-arrow that has 4 options under it - Delete Post, Delete & Remove User, Hide Post, and Report.

Clicking Delete is supposed to work, but occasionally with Facebook glitches, it remains visible to everyone else in the group.

'Hide Post' will not delete the photo from the albums, but it will stop showing on the group wall.