minor updates

Author: gregli-msft

powerapps-docs/maker/canvas-apps/functions/object-app.md

@@ -57,11 +57,14 @@ Nobody wants to lose unsaved changes. Use the **ConfirmExit** and **ConfirmExitM
 > [!NOTE]
 > **ConfirmExit** doesn't work in apps that are embedded in, for example, Power BI and SharePoint.
 
+> [!NOTE]
+> At present, these properties cannot reference controls on any screens besides the first screen.  If references are made, no error will appear while authoring, but the resulting published app will not load in any players.  We are actively working to lift this limitation.
+
 ### ConfirmExit
 
 **ConfirmExit** is a Boolean property that, when *true*, opens a confirmation dialog box before the app is closed. By default, this property is *false*, and no dialog box appears.
 
-Use this property to show a confirmation dialog box if the user has made changes but not saved them. Use a formula that can check variables and control properties (for example, the **Unsaved** property of form controls).
+Use this property to show a confirmation dialog box if the user has made changes but not saved them. Use a formula that can check variables and control properties (for example, the **Unsaved** property of the [**Edit form**](../controls/control-form-detail.md) control).
 
 The confirmation dialog box appears in any situation where data could be lost, as in these examples:
 
@@ -70,9 +73,8 @@ The confirmation dialog box appears in any situation where data could be lost, a
   - Closing the browser or the browser tab in which the app is running.
   - Selecting the browser's back button.
 - If the app is running in PowerApps Mobile (iOS or Android):
-  - Running the [**Launch**](function-param.md) function.<br>If you run this function in a browser, another tab opens. No data would be lost, so the **ConfirmExit** function doesn't run.
-  - Closing PowerApps Mobile.
-  - Swiping to switch to a different app.
+  - Running the [**Launch**](function-param.md) function.<br>If you run this function in a browser, another tab opens (no data would be lost, so the **ConfirmExit** formula doesn't evaluate).
+  - Swiping to switch to a different app in the player.
   - Selecting the back button on an Android device.
 
 The exact look of the confirmation dialog box might vary across devices and versions of PowerApps.