ℹ️ Note: requires a POS integration.
Your POS can't set upsell or popular items, so you set them in Owner. Once you've set them they stay set, even when your menu resyncs from your POS.
If an item stops showing as upsell or popular
This usually happens after a menu update where the item was deleted in your POS and replaced with a new one. Owner treats the replacement as a different item, so the setting doesn't carry over. Here's how to reset it.
In Owner, unmark the item as upsell or popular.
Wait for your next menu sync, or publish the menu from Otter to push it through right away.
Mark the item as upsell or popular again.

