I'm on an Android phone (v8.1). I can't upvote forum pists in the app. Someone suggested click the triangle, but I don't have a triangle!
Also my app is up to date.
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To upvote a forum post, first click on the post so that it pulls up the post in its entirety. Secondly, click on the comment you wish to upvote, then click the star that pops up. Hope this helps!