To delete a single media item:
Click on the bin icon on the top right and then 'Delete'.
To delete multiple media items:
Hover over the top left corner of thumbnails until a button appears.
Select media items to delete.
Click 'Remove from team'
If in a team gallery;
Press down on the image or video you want to delete.
Once your selection has been made, click the 'Remove' button on the very right along the bottom bar.
If viewing an image or video;
Click on the bin icon in the top right and then 'Yes'.