We have a solution in Visual Studio 2010 for a SharePoint 2010 application that is currently in Production (version 22.214.171.124).
I am making some changes to the solution to be deployed as version 126.96.36.199. I need to be able to deploy the new solution as an upgrade, and see I can create upgrade actions in the Feature.xml files for the various features that are included in the package (see MSDN: Upgrading Features).
However, there is no Feature.xml file in the VS solution, and am wondering how I go about creating the upgrade actions. Do I need to edit the Feature.xml files outside of visual studio or are there some "hidden" away within visual studio?