Restrictions on removal
Asset removal is only possible for people with moderator or contributor role.
It is not possible to remove Portal snapshots from review tasks.
In the asset explorer, click on an asset to open the asset detail view.
Open the right sidebar
with the icon.
In the sidebar, click on the "Tasks" tab. There, you will see all tasks to which the asset is attached.
Right-click a task and select "Remove from task".
You can also remove an asset from task in the task detail view.