If you want to clean up your media library, you can delete image or video assets that you no longer need.
To delete a media asset from your media library:
In any of your videos, select any media asset inside its placeholder.
In the right panel, click the asset thumbnail.
Your uploads library—with all its content—is displayed.
Locate the media asset that you want to delete.
Hover over the asset thumbnail and then click the trash icon in the corner.
If you're sure that you want to delete the asset, click Delete.
The media asset is deleted from the media library.