AppCenter Plugin hardcodes uploaded Android symbols to be AndroidProguard when uploading to AppCenter. However, this is incorrect in the case of JNI projects. We either need a second field for specifying Breakpad symbols with Android projects or a selector to determine which type of symbols are being uploaded. 

As a workaround I have rebuilt the plugin for use in our cluster by changing the hardcoded value to Breakpad as we only require native symbols. However, as this would break other projects so I am not creating a pull request.