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Screenshot adding a callback to a callback


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Hello Babylon community!! I have a query concerning implementing a callback in a callback for taking a screenshot of cameras.  I have this function call 

createCameraView: function (camera)
    let src;
    BABYLON.Tools.CreateScreenshot(engine, camera,  { width: 293, height: 150 }, function (data) { src = data; });
    return src;

the callback function actually saves out the image for each camera (including the hidden on's) in the scene as a base64 to the images src tag, but that saving part takes time.  The part that I am confused about is actually setting up a callback for the callback, that lets me know when the image itself is done rendering.  I am sorry I do not have a playground as most of this code is internal.  And also please forgive me if this is not enough information to understand my issue.  Cheers!

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