How do I see where my flow failed?

There are a few different ways you can see where your flow failed:

If there are errors you need to resolve or fix within a flow, a pink wrench will show up on the bottom right hand corner of that step.
In the upper right hand corner of the canvas, click the button called “Run flow”, and within this tab, there will be a pink statement telling you to “fix x issue(s) in this flow”, and after you click into this statement, it will tell you which step there is an issue in.
If you want to see historical failures all time, click the “Run History” button located in the upper right corner of the canvas (which looks like a timer), and it will show you which runs have succeeded, and which runs have failed.