To add assets to the static asset group, follow the below-recommended steps:
Login to the portal as an administrator.
Click on Manage → Manage Asset.
Click on :Action_button: icon located in front of the asset name to which you would like to add in the Asset Group
Then click on Manage Linked Groups option and select the asset group.
Click on the Save button to update the group.
The assets will be automatically added to the Attribute-based and Active Directory groups based on the configurations.