The Media Gallery is a searchable list of all media that has been assigned to a Blackboard course.
Available via Control Panel -> Course Tools -> Media Gallery, you can also add the tool to your Course Menu to give students access to it where they can upload their own videos pending your approval.
You don’t need to use the Media Gallery to upload media to your Blackboard course – you can use the mashup tool or the Kaltura content type, and students can use the mashup tool anywhere they have access to the text editor (eg blogs, wikis, etc)