[docs] Add note about dynamic content in modals manager (#4042)

docs/src/docs/others/modals.mdx

@@ -178,3 +178,13 @@ You can open multiple layers of modals. Every opened modal is added as first ele
 To close all opened modals call `modals.closeAll()` function:
 
 <Demo data={ModalsDemos.multipleSteps} />
+
+## Dynamic Content and the modals manager
+
+Note that when using the Modals manager, dynamic content is not supported.  
+Once modal is opened, a snapshot is saved into internal state and cannot be updated.
+
+If you intend to have dynamic content in modals, either:
+- Use internal component state, or
+- Use the modal component instead of modals manager
+