www.uploadProgress not working on Android

I've implemented an upload progress bar that works flawlessly in editor and on iOS, but for some odd reason it's not working on Android.

I've already checked and the issue is that www.uploadProgress value is always 1 on Android. This doesn't seem to be an issue on my side nor the server's side since it works just fine on other platforms. Is it possible that the www.uploadProgress feature is not working properly on Android?