To my great surprise, I've discovered that one can't copy-paste expressions in MS Flow. I have some things which I re-ule between flows, and we all know that the WDL expressions aren't the easiest thing to read. Would be nice to have some copy-paste. Thanks!
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You can now copy and paste content from inside of actions, including expressions. You can even copy the content into a text editor and edit it there if you want.