Like with the book itself, there are probably file sizes that won't upload to KDP, but that size is certainly similar to the 50 MB total file size. (lifewire.com)
Resolution can be bigger as long as the total file size does not exceed 15 MB. (massaudubon.org)
Also, remember that the game will have a total file size of 95 GB during its launch. (wccftech.com)