To post a video into D2L/Brightspace, make sure you use a permalink/stable link or the embed code. Those are usually found through a "Share" link by the video you want to use.
To find videos in databases available through the library, try these:
Provides access to 20 modules with clear 3D images and interactive models, narrated animations and illustrations, dissection slides for labeling, clinical case studies, the impact of aging on each body system, pronunciation guide, quizzes and more.
For instructions in using, view a pdf User Guide, a 7 minute video, or a longer 35-minute online tutorial.