SSO OIDC and SAML apps

We have two different Apps. One on OIDC and and one on SAML within the same org. The OIDC app uses the OKTA widget(self-hosted) for authentication. While the 2nd app is embedded in to first one. Is there a reference diagram or any guide available to do the SSO?

When logging into the OIDC application the Okta session should be getting stored in the users browser. So if the SAML application is launched with the App Embed Link defined in the SAML app in Okta, the session cookie should be sent and SSO should happen.
Are you not seeing this?
Once a user logs into the OIDC application how is the SAML application accessed?