@Matthy79 wrote:
You just delete the action and paste it back again (with the changes made in notepad). What exactly are you trying to change?
What are you talking about? Please clarify what steps you're taking here exactly.
Because what they're talking about is copying code from the "Peek Code" window. They take that, paste it into Notepad, make changes, copy it, and bring it back to PowerAutomate, but then what? You can't paste that code into the Peek Code window.
You said delete the action and "paste it back", but there is no visible option to "Paste" anything. There's also no option to create a new Action from raw code in the clipboard.
The only thing I can assume is you're talking about this:

But that doesn't allow you to paste raw code you copied from Notepad. That only works if you use this:

But the code you copy when you select that option isn't editable in Notepad.
Maybe you're talking about an older version of the classic designer, because the current classic designer does not have any obvious method of doing what you're suggesting.