Background Setup
Firstly, you have to create a Google account: https://accounts.google.com/signup
Then go to Google Photos https://photos.google.com/
In Album, click on “Create a new Album." Choose an Album name (example, OnlycastBackground)
On Onlycast Cloud, go to Locations, click on the Action Menu of a location, and click on Background.
Select a background and click on Generate Background:
Drag and drop the content of the downloaded zip file to your Google Photo Album: