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Procedure: Define your step with Up as direction and enter 30 in the Scroll Size field. Your step will look like this:
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NOTE: The Similarity field is to adjust the matching approximation (minimum of 0.10 - maximum of 0.98 - default of 0.75) which improves the accuracy of matching the exact image in the case of multiple images with similar appearance.
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Desktop commands are controlled by Locator Timeouts under User Execution Preferences. If the locator timeout is not sufficient enough for the command to find the element, you can increase Locator Timeout to give the step more time to work. It’s recommended to use 20 seconds for desktop commands.