Figured it out. I had a grey triangle with an exclamation point to the right of "Store Listing" in the pane to the left. Hovering over it, it said "You need to add at least 2 non-Android TV screenshots." Uploaded another screenshot and now there is a green checkmark instead of the triangle, and the release button is enabled.
9Apps 4.9
![국세청 홈택스 [손택스] on 9Apps](https://sg-res.9appsdownloading.com/sg/res/jpg/f7/df/69cc2f90120ec331db2630e0f5b6-6dh.jpg?x-oss-process=style/jmq200)
