Hi @ukrsolid​,

Currently the SharePointOnlineConnector can only be used to manage files on SharePoint Online by uploading, downloading, deleting files, and deleting folders.

If you want to create a document set, you'll need to use the SharePoint REST API. You might be able to do get this done with the HTTPCaller by following the suggestions on these articles:

1. Create document set with REST API in SharePoint Framework
2. Creating a Document Set with the Sharepoint 2013 REST API

thanks @chrisatsafe​  ! I will check SharePoint REST APIs