File Upload Progress Bar Not showing

I have followed the documentation to add a progress bar to a file upload form but it is not showing. Not sure if it is a similar issue I had before with where the tutorials use an older expression builder.

I’ve tried to adjust the dynamic style attribute in code view as before but still no joy.

Here’s the code:

<div class="progress" dmx-show="form2.state.executing">
						<div class="progress-bar bg-success progress-bar-striped progress-bar-animated" role="progressbar" style="width: 0%;" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100" dmx-style:width="form2.uploadProgress.percent+'%'">
							Uploading ...</div>
					</div>

Thanks in advance!