Looks like fun - I'm using Zoom (the basic/free version) and in the settinngs I have Virtual backgound switched on BUT can't see how you upload the image. Using Firefox on a PC
This is what it says on the screen - where are the "Zoom Desktop application" settings?
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Virtual background
Allow users to replace their background with any selected image. Choose or upload an image in the Zoom Desktop application settings.
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Thanks
Rob