Hey there atfpodcast,
Hope you’re well today!
If you’re referring to videos, BuddyPress Activity Plus actually isn’t meant to upload videos. The big issue here is the size. Depending your hosting, connection, it could take a long time to upload a video – this takes up server resources and could slow down your site.
This is why most sites you visit use embedded YouTube or Vimeo videos. It leaves all the heavy lifting up to the sites dedicated to hosting videos. This way you know that your video will be served up fast and efficiently each and every time(for the most part).
Hope this makes sense ??
Best regards,
Bojan