1. Click on the "Build App" button.
  2. In the following dialog first select whether you wish to build a preview app or a release app (2.1). 
    Note:  If you are building a release app, you first need to specify the platforms for which it is intended to be built (2.2). his selection depends on the settings in the basic settings under "Select your target platforms for your app." Furthermore, for the release version, you must have the appropriate version number for the App Store, Google Play, and Amazon Store (2.3),
    • Note: These numbers may be parallel to the numbers in Purple DS Manager. You can use the options "New minor version" and "New major version" options. If you don't want to or if you move your app to Purple DS and already use a different numbering, you can overwrite the version number with "Overwrite / set version" and set a numbering. 
      Please note that the previous release version of the app will be overwritten.

  3. Finally, click on "Build" to begin building the new app version. It lasts a few minutes. Afterward, you can download the new version to publish it in an app store.

NOTE: A release app cannot be installed directly on your device because it is intended for distribution via an App Store.
For Apple, you can use the tool 
TestFlight to install and test this version.
Android offers a pre-release as a 
beta test app.

If you want to install an existing preview version of the app after building a release app, you can do this via the 
QR code. After resolving the link in the QR code, a browser window opens. Below the platform logo, you can see the last built app version. This is offered as the standard download.
Below is a link to other versions you have already built in Purple DS Manager.
Click on "Other versions" (step 1) to open a pop-up and display the other available versions.
Select the preview version (step 2). This is then easily installed on the device.