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I am learning Unity3D game development recently. After I created a new project, I downloaded several resources from the assets store. I dragged the prefab to my own scene and used it in the project. Then I found that the scene was deleted from the resources originally downloaded from the assets store. The prefab used inside does not have material. If I want to upload it to github for backup without deleting it, the project file can be about 300MB. I saw that a png picture is about 10MB.

github這么大的文件每次都不能上傳成功，各位大神是怎么搞的，能給個建議不？