Hey there! As others have already mentioned, options to vote, save and reply to comments using the long-press menu are currently available in the nightly builds and will eventually come to the general builds.
If you are not on the nightly build, you can also enable comment action buttons which will allow you to reply to comments without the use of swipe gestures. To enable this, go to Settings -> General -> Comments and find “Show Comment Button Actions”. Let me know if you need any more help or have any further questions!