Remove a file or folder in Resources
From EdTech Help
Go to Resources
Select the Resources tool from the Tool Menu of your site.
Select one or more items, then click Move to Trash
To remove a Resource file or folder select the item(s) by checking the boxes next to each one to be removed, then click Move to Trash.
Note: Alternately, if you are removing one item at a time, you may select Move to Trash from the item Actions menu instead.
Click Remove again to confirm
Items are removed
Note: If you remove a folder, all of the items inside the folder are also removed.