I had a redmi note 6 but it has broken and I had to take my Xiaomi Redmi Note 4G.

I need to know if you can customize the notifications of the applications in a xiaomi redmi note 4g, specifically I wanted to change the sound of Skype because it is very weak and I do not hear it. From the Skype application it is not possible and I cannot find any setting from the phone that allows it to be done.
If someone could tell me how to do it, I would appreciate it.