Hi Intel Support
I am unable to upload package Windows 10 UAP to Windows Store.
I renamed the file and add file extension to .appxupload, I clicked on the upload and selected the file, it says
(Appname.cordova.window10.201610210446.appxupload' contains 54 files. Make sure it contains fewer than 16 files and then try again.)
You do not need to rename anything as the Intel XDK provides you an appxupload inside of the archive you download. Do not rename and submit the archive you downloaded, instead extract the archive and use the appxupload file inside of it.
Let me know if this resolves your issue!