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On Android developing, I solved this issue by "build and run" with USB cable (not transferring apk via Dropbox).
I tried move "Editor" folder in UMJ folder from plugIns folder to Asset folder, and I solved by myself. Thanks!
Now I import Ver.3. But it's difficult to access to UMJ from my javascript. I've already tried to move UMJ folder into "PlugIns" folder, but it's...
I'm java user. Do u have an advice to access to your C# asset from my java? (I want see UMJ's joystick movement values from my java script.)