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Hi Egge-Jan Pollé,
Thanks for replying, I did look at the page Create Service—ArcGIS REST API: Users, groups, and content | ArcGIS for Developers. And I did try to create a feature Service using Create service, but I'm getting "You do not have permissions to access this resource or perform this operation" error. FYI, I'm not administrator and I'm just the user in the portal.