Clarify snapshot docs (#1782)

## Description

Add some screenshots to make the instructions more easily to be followed
by users.
(This is the 2nd try of
#1781)

## Notes

This is a part of the tasks stemmed from an internal ticket:
elastic/support-tech-lead#1596
@eedugon @shainaraskas @jakommo for anything that's unclear, let's
discuss this in the internal ticket.

## Preview


[deploy-manage/tools/snapshot-and-restore/create-snapshots.md](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/1782/deploy-manage/tools/snapshot-and-restore/create-snapshots)

---------

Co-authored-by: Edu González de la Herrán <[email protected]>
Co-authored-by: shainaraskas <[email protected]>

Author: 3 people

deploy-manage/tools/snapshot-and-restore/create-snapshots.md

@@ -11,9 +11,9 @@ products:
   - id: elasticsearch
 ---
 
-# Create snapshots [snapshots-take-snapshot]
+# Create, monitor and delete snapshots [snapshots-take-snapshot]
 
-This guide shows you how to take snapshots of a running cluster. You can later [restore a snapshot](restore-snapshot.md) to recover or transfer its data.
+This guide shows you how to create, monitor and delete snapshots of a running cluster. You can later [restore a snapshot](restore-snapshot.md) to recover or transfer its data.
 
 In this guide, you’ll learn how to:
 
@@ -187,6 +187,20 @@ We recommend you include retention rules in your {{slm-init}} policy to delete s
 
 A snapshot repository can safely scale to thousands of snapshots. However, to manage its metadata, a large repository requires more memory on the master node. Retention rules ensure a repository’s metadata doesn’t grow to a size that could destabilize the master node.
 
+### Update an existing {{slm-init}} policy [update-slm-policy]
+
+You can update an existing {{slm-init}} policy after it's created. To manage {{slm-init}} in {{kib}}, go to the main menu and click **Stack Management** > **Snapshot and Restore** > **Policies**, click **Edit** `✎`, and make the desired change. 
+
+For example, you can change the schedule, or snapshot retention-related configurations.
+
+
+![change schedule](/manage-data/images/elasticsearch-reference-change-slm-schedule.png)
+
+![change snapshot retention](/manage-data/images/elasticsearch-reference-change-slm-snapshot-retention.png)
+
+
+You can also update an {{slm-init}} policy using the [{{slm-init}} APIs](https://www.elastic.co/docs/api/doc/elasticsearch/group/endpoint-slm), as described in [Create an {{slm-init}} policy](#create-slm-policy).
+
 
 ## Manually create a snapshot [manually-create-snapshot]
 
@@ -242,7 +256,11 @@ GET _slm/policy/nightly-snapshots
 
 ## Delete or cancel a snapshot [delete-snapshot]
 
-To delete a snapshot in {{kib}}, go to the **Snapshots** page and click the trash icon under the **Actions** column. You can also use the [delete snapshot API](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-snapshot-delete).
+To delete a snapshot in {{kib}}, go to the **Snapshots** page and click the trash icon under the **Actions** column. To delete multiple snapshots at once, select the snapshots from the list and then click **Delete snaphshots**. 
+
+![delete snapshot](/manage-data/images/elasticsearch-reference-delete-snapshots.png)
+
+You can also use the [delete snapshot API](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-snapshot-delete).
 
 ```console
 DELETE _snapshot/my_repository/my_snapshot_2099.05.06