You can open an app from the hub by clicking it. You can also import an app that is not in the hub.
Opening an app that is not in the hub
You can open an app you have received from someone else or downloaded from another Qlik Sense deployment. You need to upload the app before you can open it. For information on upload apps into the cloud hub, see Uploading apps to the cloud hub.
When you have uploaded the app it is available in the hub.