Unfortunately, our examples cannot cover any possible business scenario. We try to add as many examples as possible, but every application has different requirements. If you want to put a progress bar in a modal, you can combine it with our smart-window component.
Please visit this: https://codepen.io/svetoslavb04/pen/RwJavXN
There you can see a very very very basic implementation of a loader modal.
You can implement your own technique for a loader and put our progress bar in it.