Change button don't update new image preview

[francisrod01]

Hi, I have a problem with change event to new image in form.

I try reproduct a single form upload as code example.but I did not have success.

Note: controller.dropEnabled is a parameter in controller initialize with true.

<div class="form-group" 
	flow-init
	flow-file-added="controller.addedFile($event, $file, $flow)"
    flow-drag-enter="style={border: '5px solid green'}"
    flow-drag-leave="style={}"
    ng-style="controller.dropEnabled && style">

	<div class="thumbnail" ng-hide="$flow.files.length">
		<img ng-src="images/no-image_200x150.png" alt="No image"/>
	</div>

	<div class="thumbnail" ng-show="$flow.files.length">
		<img flow-img="$flow.files[0]" />

		<!-- or this image implementation below... -->
		<img app-flow-img="$flow.files[0]" app-flow-img-change="src=$src" ng-src="<% src %>"/>
	</div>


	<div class="form-group">
		<div class="form-group" ng-hide="$flow.files.length">
			<button type="button" class="btn btn-success"
			flow-btn>
			Select image
		</button>

		<p class="form-group" style="margin-top:5%;">OR</p>
	</div>

	<button type="button" class="btn btn-primary" ng-show="$flow.files.length" flow-btn>
		Change
	</button>

	<div class="form-group alert" flow-drop flow-drag-enter="class='alert-success'"
		flow-drag-leave="class=''" ng-style="controller.dropEnabled && class && !!$flow.files.length"
		style="text-align: center; padding: 100px 0;">
		Drag And Drop your file here
	</div>

</div>

References

http://flowjs.github.io/ng-flow/
Issue #37 - Binding to existing image