The last step we need to take before we can see our changes on a device or in the Platform emulator is to update our Dynamic Version configuration on the platform. The Dynamic Version is assigned to our Application/User Device record and specifies which versions or resources should be used when our user/device pairing is observed.
For the closed beta we can update this Dynamic Version record to manually specify the new Startpage we have uploaded. To do this go to the Mobile Application record for our seed application and find the Dynamic Versions section. There should be only 1 available, select this to view the record. Once selected you should see a detail screen for the Dynamic Version with a Change Start Page URL button. Click this and enter the value that relates to our new startpage. The startpage will be named in this form, with values coming from our package.json configuration file;
/apex/<SF_APP_NAME>_<SF_APP_VSN>
For example the value could be /apex/SeedApp001_010
Once this has been done you should be able to view the updated app in the Platform Emulator or on the device. You will only need to update this Start Page URL each time you update a newly versioned version.