Yes, this is correct! You _can_ update the GPU Layer data, the API allows it, but you pay the upload cost each time, which is why we framed it as for 'backgrounds' - but in reality, it could be used for anything animated. I mean, you don't HAVE to create 1m sprites! You could just do 100 and it'd still be significantly less overhead than 100 actual sprites. Going to be interesting to see what devs come up with here.
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