I currently have the privilege of viewing up votes and down votes on both Stack Overflow and Portuguese Stack Exchange. However, I cannot view these votes specifically on PT.SE posts from the Android app (version 1.0.68). There appears to be nothing wrong with seeing vote counts on SO or Meta SO:
For PT.SE, only 100 reputation is required to see the vote counts (I have 874 rep at the time of writing), and there is no problem with the feature when using a browser.
However, long-pressing the vote count on PT.SE posts does nothing. This sounds like a bug in the mobile application. Can it be that the app was hard-coded to Stack Overflow's reputation requirements?