Any idea of how I can link the progress target values to an array of slides?
In order to achieve this you’ll need to write an onChange function for your slideshow. In it you need to use the currentIndex of a slideshow that should be equal to a progress bar value. You can also set a targetValue of a progress bar to be the same as the slideshow slides.length - 1, so there is no need to update the progress bar targetValue each time you change a number of slides. In the end you’ll get something similar to this:
export function slideshow1_change(event) {
let index = $w(“#slideshow1”).currentIndex;
$w(“#progressBar1”).targetValue = $w(“#slideshow1”).slides.length - 1;
$w(“#progressBar1”).value = index;
}