add spinner and disable the upload button when upload files

[longshuicy]

Right now upload files might take longer on the deployment site. To avoid user double clicking or confusion, need to add a spinner as well as disable the upload button

[longshuicy]

Spinner can be just displayed on the button

[longshuicy]

"react-loading-overlay": "^1.0.1",

<LoadingOverlay active={loading} spinner text="Saving...">
 {component you want to cover}
</LoadingOverlay>

loading is the flag to turn it on and off

// step 1
	const onFileSave = (formData:any) =>{
		setFileRequestForm(formData);
		handleNext();
	}

This is the button to click; add the loading flag somewhere inside to turn the loading on and off