Also when you upload it, as long as you don’t resize it or anything, it automatically will be placed in the right spot of the background.
So then when you start the scene you want to use it in, you can easily just do
INT. BACKGROUNDNAME with OVERLAYNAME at layer #
Then save and preview it.
And then copy the overlay spot and paste it and just add the zone that it’s in. I hope that made sense. 
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