>>7156056 (lb)
[pop] is for an embedded video. Embedded videos exist on their host website and are retrieved from their host website, and [pop] allows you to bring up the page, rather than viewing the video here. You can also upload a video file (.webm, .mp4) and the file is uploaded to 8ch and then retrieved from 8ch when others watch it. There is no website to [pop] for 8ch hosted files, so there's no [pop]. To embed, click [Show post options & limits] under the post body/comment field when creating a new post and then paste the link into the embed field. If that's not what you meant then [pop] may be dependent on which website you're embedding.