Heres how you attach videos, photos or other media to your teams athletes bio pages. 

-Find the content you want to attach (this could be a photo, video, news, etc.)

-Click the attach to profiles button below the media

-Start typing the desired athletes name in the top left field.  Select the desired bio from the dropdown, then press attach to member. 

Now when you go to the athlete tab on your team page and click on the athletes name, you can see the photo attached to their bio.