Refresh query only when data is changed

Occasional Contributor

I have data being entered into an excel sheet that is on the Dropbox and is updated by users through an app, when they save the changes the excel file in Dropbox is updated.  I have an excel file that I want to update the changes but I only want to refresh when the data in one column is updated or changed from the source file in Dropbox.  Is there a way to only update when the data has changed?  I cannot find a way to enter code on the file in Dropbox so I was not sure if this was possible.  

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