You have no mention of this in your module docs. This means that if you try to access the file straight after the module returns, it usually doesn't exist yet! This means either adding a Sleep module or implementing some kind of retry option.
The current OneDrive "Copy a file" module doesn't return anything as output - ideally it should return the action URL as listed under the second link above. That would allow a scenario to check for copy completion at a later stage.
---
Created by Tereza Klobouckova