We have an On-Premise Sharepoint 2013 server with 5 Root level Sites. With Sharepoint Online I need to consolidate the sites under the /sites/ folder.
I've seen how to Export and Import Document Libraries, though not an Entire site with all of its Lists/Apps .
I Tried to Save a Site as a Template and include content, though when creating lists it could not create attachment folders. Then I tried to Save a List as a Template, When I Exported a List As a Template from one site and imported it to a /Sites/Company/department/list the Lists has references to SiteAssets that are still referencing /department/siteassets from the old site.
What is the Best way to Migrate the sites from the On-Premise 2013 server to SharePoint Online? Doing this List by List is going to take a month or more, there has to be a better way...