At the Bottom of the Comment Box when you select Choose Files once the image shows it has been Uploaded just click Submit Reply it Automatically gets Inserted in the Post without clicking anything else. The Gallery Tab at the Top of the Page is a different Submission and Entries have to be done Separately. If you try copying the Picture from the Post in the Forum to the Gallery it will move the Image to the new Destination leaving a blank spot on the Attachment Uploaded in the Forum. Doing each Entry Separately will not cause any Image to not appear as Posted.