@Asyas_illos in Procreate, you name files in the gallery. Tap on a canvas name in the gallery and a box should pop up that allows you to change the name of that canvas. When you export a file, that's the name that will automatically be put as the file name.
However, if you share when the canvas is open, there is often the ability to change the file name there as well. Naming the file you're exporting does not change the canvas name in Procreate.
Hope this helps!