Hi @figtreenbpt! While there is no way for us to send a pop-up notification to your phone for a low stock alert, you can have your phone alert you for incoming emails, which will allow you to be notified in the moment when an item hits that threshold.
Stock alert notification emails are sent to the email address associated with your Square account daily if any item with alerts enabled falls below the alert threshold. The email will list any items that fell below the alert threshold today, as well as any other items that fell below the alert threshold on previous days.
Let me know if you have any other questions. 🙂