Thumbnail creating fix for SaveAs and Remix

[Algorush]

PR for Reviewing

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[kfarr]

How to test:

• - as a user previously if I remix a scene the screenshot is not created; now see if it is created
• - as a user if I create a new scene and press save, the screenshot should also be created
• - as a user if I want to choose a new screenshot for existing scene, that function should still work

[kfarr]

@Algorush thanks for this fix! testing worked great for all cases