Will the existing primary domain URLs automatically redirect to my subdomained URL?

No, existing primary domain URLs will not automatically redirect to your tenant's subdomained URL. Documoto is a multi-tenant platform, and each tenant has a unique subdomained URL. Therefore, we cannot setup automatic redirects from the current, generic primary domain URL (https://documoto.digabit.com) to individual subdomained URLs (https://[tenantkey].app.documoto.com).