how are you retrieving the object? I have noticed that returning an object over an association doesn't refresh the page but if you retrieve the object by microflow (and do the retrieve over association in the microflow) it will work
If you want to display the generated document immediately after you create it, add an extra action to the end of your microflow that generates the file, to use the Download File action. You pass the newly created fileDocument to the File Download action.
You can also display the file in the browser if you select the option to do so in this action.