If calling ResourceManager.GetResource(“resourceName”) doesn’t work because the framework doesn’t return the resource you want, you can bypass it with the following code snippet:
string audioFileNameWithoutExtension = System.IO.Path.GetFileNameWithoutExtension(audiofile);
int audioResourceId = (int)typeof(Resource.Raw).GetField(audioFileNameWithoutExtension).GetValue(null);
Android.Net.Uri audioUri = Android.Net.Uri.Parse(ContentResolver.SchemeAndroidResource + "://" + Application.Context.PackageName + "/" + audioResourceId);
channel.SetSound(audioUri, audioAttributes);
I used this code snippet to set a custom push notification sound
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