Windows Store app projects stopped generating the .appxupload file after installing VS 2015 Update 1

Problem A few people have noticed that their Windows Store app projects stopped generating the .appxupload file after upgrading to VisualStudio 2015 Update 1.   CauseThe project is not associated with the Store app.The StoreAssociation file path is missing from the respective project .csproj file. Either one of these causes listed above can stop the…