As for loading video to the Gallery at this time there is no real way of posting the video like you would do with YouTube or Vimeo. We recommend uploading to one of those two sites and use the share feature, copy the code and then paste it using the film strip looking icon above the reply window for your post.

Also, on the pics you can just load them into your post as you create it by clicking the Go Advanced button once you start your thread/post. There you'll scroll down and see a section called Attachments and a button Manage Attachments. Click that and you have the option to upload your file there. It's a little confusing the first time or two you use it but it works out OK for fast posting.

If you have any problems or questions you can always add a post to this thread or PM myself or Seeker BP for help.