To perform bulk actions on assets on the mobile app, first head to the 'view assets' screen. Select the assets you would like to perform an action on by holding down on the first item then tapping on the additional items you would like to perform an action on.
To perform bulk actions on assets on the web first head to the 'view assets' screen. Select the assets you would like to perform an action on.
Once you've selected your assets, you will have the option to check in/out, dispose of, report as lost, or delete the assets.