When I build and run my game my character and objects do not appear in the finished game

I have made a endless runner game and put all the details in and it runs fine in the Unity Editor but when I build and run the game the character and the obstacles I have put in do not appear.

The game acts as though they are in the final game but they can not be seen.

Any help you can give would be greatly appreciated.

Hello, are they appearing as black squares or something like that? I once have that problem with particles using a custom shader and exporting to webGL, I changed it to a similar built-in shader and it worked out, also, you could try overriding the compress format in the import settings of the sprites/textures.