You can delete an asset type only after removing it from all active and archived assets. System-generated fields like unique ID and site can’t be deleted.
Deleting is irreversible, and we cannot restore permanently deleted items. Confirmation is always required before any deletion, so be sure you're not accidentally deleting the wrong item.
Delete an asset type
Select
Assets in the sidebar or select it in 
More .Click
Settings on the upper-right of the page.In Types , clickon the asset type's right-hand side and select
Delete type .
Delete an asset field
Select
Assets in the sidebar or select it in More .Click
Settings on the upper-right of the page.In Types , click any asset type.
Find the asset field you want to delete on the right-hand side under "Add an existing field". If the asset field is currently added to the asset type, click
to remove it from the type first.Clickon the asset field's right-hand side and select
Delete field .
In the pop-up window, enter "DELETE FIELD" and click Delete field .
