How to check if storage bucket is Empty?

Before using the “Download Storage bucket”, I want to check if it is empty or not. How do I put the check in my .XAML file

First, list the storage files using list storage file activity and check the storage bucket has files or not using if activity.

Thank you, I have one more question that how do I refresh the App page at the click of a button.
I have a field file picker, once I upload a file to the storage bucket from App, i want to refresh the field on the button click.

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