If a physical location doesn't work the text should be coloured red afterwards.

example...

Capture Page Screenshot filename=c:\screenshot.png
but that doesn't work (no write rights or bad format.

the the text should be red after the run.

also hint what is wrong.
so in case couldnt write to directory
or
c:\temp\screenshot.pn is not correct format

When a robot test is run, it generates a html log that you can look at to figure out issues like this.

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