I have asked a lot of questions on this topic and have solved it.
If anyone has problems like me, I hope it helps.

If the Unity file you uploaded does not run in Gear s2, check this

The current Tizen version of Gear s2 is 2.3.2.1, so you should use the Unity version that supports it.

To upload a Unity file to Gear s2, you must use a version of Unity that supports Tizen 2.3 or later, such as Unity 5.4.5p1

If you are using the current version of Unity 5.5 or higher, the uploaded file will not run on Gear s2.

And I explained the process of uploading in detail on my blog.

http://blog.naver.com/juk1413/220978028659

I appreciate all those who answered my question.

thanks.