Add note about partial cache clearing (#5249)

Author: AlexJerabek

docs/testing/clear-cache.md

@@ -1,7 +1,7 @@
 ---
 title: Clear the Office cache
 description: Learn how to clear the Office cache on your computer.
-ms.date: 02/04/2025
+ms.date: 06/25/2025
 ms.localizationpriority: high
 ---
 
@@ -22,6 +22,9 @@ You should clear the Office cache in the following scenarios.
 >
 > To remove a sideloaded add-in from Outlook on the web, see [Sideload Outlook add-ins for testing](../outlook/sideload-outlook-add-ins-for-testing.md#remove-a-sideloaded-add-in).
 
+> [!CAUTION]
+> When you clear the Office cache, clear it completely. Don't delete individual manifest files. This can cause all add-ins to stop loading.
+
 ## Types of caches
 
 The Office cache can refer to either the web cache or the Wef cache.