First, what you list as an action is a trigger and what you list as a trigger is an action. But to answer your question, since you are using an automated trigger "When a file is Created" there is no way to run the flow manually. Even in Testing the flow will require that you navigate to OneDrive for Business and create a file for the flow to run.
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Paul Papanek Stork, MVP Blog: https://www.dontpapanic.com/blog
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