Error building assets in web5 and exe

Hello greetings to all, I hope you can support me. Recently I am learning Unity, I go to the audio introduction sections and they ask me to upload my exercise to Unity Play, well from the asset store import some assets but when exporting it to web5 and generating the exe in windows when I open it in both formats There are many less things that I have created in the scenes, someone could help me to know how to correct that problem. Thanks