As discussed in #6, there is a problem with metadata when importing the project from scratch from a zip download. [1] https://blog.doppioslash.com/mildly-painful-solution-to-unity3ds-meta-guid-hell/ [2] https://thoughtbot.com/blog/how-to-git-with-unity [3] https://forum.unity.com/threads/issues-downloading-cloning-project-from-github.322419/
As discussed in #6, there is a problem with metadata when importing the project from scratch from a zip download.
[1] https://blog.doppioslash.com/mildly-painful-solution-to-unity3ds-meta-guid-hell/
[2] https://thoughtbot.com/blog/how-to-git-with-unity
[3] https://forum.unity.com/threads/issues-downloading-cloning-project-from-github.322419/