To scan an asset from the global scan option in the bottom navigation bar:
There is a scan button in the bottom bar of your app
This scanner is used to scan the QR code or barcode of an asset, you are taken to the asset details page (providing the asset is recognized).
If an invalid QR/barcode is scanned, you will get an error message - ‘Item not found’
If you have multisite enabled and you are in site A, trying to scan an asset that belongs to site B, you will get an error message saying ‘Item not found' as well.