At times, we may need to replace outdated content, remove duplicate(s) or trash media in general. If ever the case; navigate Share pod like normal but instead of "browsing computer" to upload; you'd select media from "share history/uploaded content" and clear. Follow screenshot walk-through below for visual direction:
1) Locate Share pod and use drop-down next to "share my screen" ~
2) Click "share document"
3) From "Share history;" select content wanting to delete and then click "clear":