Add documentation for Cancel Sync client activity and button action

content/en/docs/refguide/modeling/application-logic/microflows-and-nanoflows/activities/client-activities/_index.md

@@ -20,6 +20,7 @@ The following are the client activities you can use in your microflow or nanoflo
 * [Synchronize](/refguide/synchronize/) (nanoflows only) – synchronizes data between your device and the server
 * [Validation feedback](/refguide/validation-feedback/) – does a validation check, and if this check fails, it shows a message to the end-user
 * [Clear from device](/refguide/clear-from-device/) (nanoflows only) – clears all objects of an entity only from the local database of the device
+* [Cancel synchronization](/refguide/cancel-synchronization/) (nanoflows only) – cancels the running synchronization.
 
 ## Read More
 

content/en/docs/refguide/modeling/application-logic/microflows-and-nanoflows/activities/client-activities/cancel-synchronization.md

@@ -0,0 +1,38 @@
+---
+title: "Cancel synchronization"
+url: /refguide/cancel-synchronization/
+weight: 70
+#If moving or renaming this doc file, implement a temporary redirect and let the respective team know they should update the URL in the product. See Mapping to Products for more details.
+---
+
+{{% alert color="info" %}}
+This activity can only be used in nanoflows.
+{{% /alert %}}
+
+## Introduction
+
+The **Cancel synchronization** activity cancels a running synchronization. You can trigger another synchronization later. For more information on the synchronization behavior, see [Synchronize](/refguide/mobile/building-efficient-mobile-apps/offlinefirst-data/synchronization/).
+
+## Properties
+
+There are two sets of properties for this activity, those in the dialog box on the left, and those in the properties pane on the right:
+
+{{< figure src="/attachments/refguide/modeling/application-logic/microflows-and-nanoflows/activities/client-activities/cancel-synchronization/cancel-synchronization-properties.png" class="no-border" >}}
+
+The **Cancel synchronization** properties pane consists of the following sections:
+
+* [Action](#action)
+* [Common](#common)
+
+## Action Section {#action}
+
+The **Action** section of the properties pane shows the action associated with this activity. It defines what happens when the **Cancel synchronization** activity is executed and specifies that the running synchronization process will be cancelled.
+
+## Common Section {#common}
+
+{{% snippet file="/static/_includes/refguide/microflow-common-section-link.md" %}}
+
+## Limitations
+
+* If the synchronization is in a step that applies file-related changes, it is not canceled to avoid leaving the system in an inconsistent state.
+* If the synchronization is already in its final steps, cancellation is not applied because most of the processing is already complete. The process is therefore allowed to finish.

content/en/docs/refguide/modeling/pages/on-click-event.md

@@ -69,6 +69,7 @@ When an event is triggered, you can choose what action is triggered. Possible op
 * [Show user task page](#show-user-task-page)
 * [Show workflow admin page](#show-workflow-page)
 * [Complete user task](#complete-task)
+* [Cancel synchronization](#cancel-synchronization)
 
 ### Do Nothing {#do-nothing}
 
@@ -346,6 +347,10 @@ The following properties are specific for this event:
 * **Close page** – Specifies whether the current page should be closed.
 * **Commit** – Specifies whether the data container object should be committed when marking the task as completed.
 
+### Cancel Synchronization {#cancel-synchronization}
+
+The **Cancel synchronization** event cancels a running synchronization. You can trigger another synchronization later.
+
 ## Read More
 
 * [Pages](/refguide/pages/)