What's going on here?

Development Modding ARK: Survival Evolved
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I’m a rookie. I did a mod test, but I uploaded it a couple of times.

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Verify your ADK, and update Steam.

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So it’s still working. If you have steam guard on your account just enter the code into the black screen and press enter, if you don’t have steam guard just leave it be it will still upload provided there are no problems with the information you enter for things like the description.