If an authors assigns copyright in a publication to the publisher, in most cases the publisher's "Version of Record" cannot be added to ScholarWorks. Many publishers do allow other versions to be posted.
If the author retains the copyright in the article, and doesn't license the rights to the publisher, any version the author wants in ScholarWorks@GSU can be posted.
*Embargos require that a version not be made available in ScholarWorks@GSU until a set amount of time has passed since publication - usually between 6 months and 2 years.
Reading the Article Versions box, did you wonder why the publisher gets to decide what you can post? When you sign a publication agreement with a publisher, you usually are also transferring copyright in the article to the publisher. That means the publisher controls dissemination, through the journal, via an Institutional Repository (e.g. ScholarWorks@GSU), or on your own website.
You can negotiate dissemination rights with the publisher. One way to do so is by including an addendum to when you submit the publication agreement. The addendum indicates what rights you want to retain. SPARC (the Scholarly Publishing and Academic Resources Coalition) has a model Author Addendum you can use.
Once your publication is posted in ScholarWorks@GSU, it is easily found by Google and other search engines. You will get monthly reports showing the number of downloads for each article, where the user who downloaded each article is located, and what search terms led to your publication.