can the Gallery Field can automatically display media attached to a post? I have a plugin that downloads some pictures in the media library and links them to posts. I would like to display these pictures in the Gallery field without having to re-upload them.
Is it possible?
Yes, the gallery field uses the native WP uploader to select images from.
You will not have to upload the images again, but you will obviously need to select them to add them into the gallery field.