No matter what I upload to Facebook instant games, it will not load the game I am left with a “0% loaded” message, though the game clearly loads in the background. This is even the case with a simple build just to display a sprite.
There is very little information on this type of error on the internet is this because Unity is not the best choice for developing an instant game for FB?
//load assets here if necessary
and then include it in index.html manually:
//add this line
also if your game is WebGl build it will not work on mobile. for that you should use unity tiny or another engine.