Confused on how to code a Task in Viewmodel

Category : Mobile Programming
I am trying to get a RingToneTask in my Viewmodel. But since, as far as I understand, a portion of the ringtonetask has to be put in the Constructor on the Mainpage.cs, I dont know how to go about coding the task into my viewmodel. View model is below. For testing purposes, I had the debug.writing portion in there. Now what I want to try to do is replace that debug.writing line with a code that will save the ringtone using the soundpath as a source. Right now, as is, the button used just plays the sound and does not give the option to save as RingTone. If it would help, I have my solution shared on Onedrive is someone is willing to take a look.
I went ahead and uploaded i

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