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When I share high fidelity prototype of my project in browser it shows transparent background.
Here are some Screenshots of the issue.
Design in XD -
Design in shared prototype -
Which Windows OS are you running and which browser? Does it work in another browser?
A hack would be to place a rectangle with your background color on each artboard rather than use the artboard fill.
Using Windows 10 and it doen't worked in other browser too.