The native Excel actions in PAD do not interact with cell formatting in any way. It cannot set highlighting, nor can it "see" it. In order to do something like this, you would need to use scripting, such as PowerShell or VBScript (which can be invoked from a PAD flow). You can either use a script to apply a filter to the file based on cell highlighting, and then use Read from Excel spreadsheet, to retrieve the data when it's filtered, or you can simply use a script to read the data.
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