Shopify App Updates & Review Process

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I was able to find great documentation regarding how apps are reviewed and processed the first time around. However, I wasn't able to find much of anything regarding updates, and the introduction of additional features/how that's treated by Shopify.

Are apps put through a review process periodically, or whenever you want to make adjustments? Are there any types of updates that may trigger a review, or require you to reach out to Shopify to review first before you push said changes to production?