The mirror filter mirrors only left-right but I think there should be an option to choose between left-right and top-bottom mirroring.
Ha!
Saw this post a couple of hours ago on a tablet - booted up the PC to offer the EXACT same solution with screenshots, to find you’ve already done it!
You can also combine mirror and rotate (at any angle, not just 180) which I’ve used to change the direction and position of pre-rendered alpha’d or chroma-keyed animations many a time.
Do do know how hard it was to stand on my head while someone took this shot?
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Why didn’t you just send the file to someone in Australia and ask them to do the picture for you 
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