WebDAV editing is also integrated in the Insert/Edit image or media and Insert/Edit link dialogs of the WYSIWYG editor. In these dialogs, the Edit in client application () icon is displayed on the Attachments, Content and Media libraries tabs, next to files with the supported file extensions (see Settings for more details).
For the icon to be displayed on the Attachments tab, the Modify permission for the current document needs to be granted to the current user. On the Content tab, the icon is displayed only with documents for which the Modify permission is granted to the current user. Please refer to Development -> Membership -> Permissions -> Document permissions for more details on the three-level document permissions hierarchy in Kentico CMS.
For the action to be available on the Media libraries tab, the user must either have the Manage permission for the Media libraries module, or the Modify file permission in security configuration of a particular media library. See Modules -> Media libraries -> Security -> Media library permissions for more details.