Adobe Experience Platform Launch has been rebranded as a suite of data collection technologies in Adobe Experience Platform. Several terminology changes have rolled out across the product documentation as a result. Please refer to the following document for a consolidated reference of the terminology changes.
To ready an extension package for uploading in Adobe Experience Platform, consult the API docs for the @adobe/reactor-packager command-line tool. It outputs a prepared zip file in the expected format for uploading an extension.