Comparison Slider shows a blank image

I was attempting to create a form using the "Comparison Slider" widget. Either I am experiencing "user error" or the widget is depreciated or no longer functioning as intended.

I placed the widget in my form, selected the "Widget Settings" icon. Under the "General" tab there are only the 2 fields: one for "Image Before" and one for "Image After". The other tab is "Custom CSS". There is no placeholder text to give an example. No "Choose File button". "Sub-lables" do not indicate an address format. They, in fact, have exactly the text (for the "Before" image I think) under each field. No "Drag and Drop" an image capability. No instruction whatsoever that I can see. 

So first, I attempted using public files from my Dropbox account with the provided sharing link, and next I tried the same from my Google drive account. It did not work – no image loaded. I deleted the widget and tried again. Again, nothing – just a blank form.

Is this widget still functional? If so, what am I doing wrong? 

As I checked your form, it might be that your dropbox is not giving access to the widget that is why the images are not showing.

I cloned your form and used my images and the widget is working fine.

Make sure your image address is working correctly.

Let us know how it goes.

Thank you! It seems that I warehouse my images or host on a site other than a free Dropbox or Google Account, it works as expected.