SAML configuration, importing XML settings?

Dear all,
I’m trying to configure SAML with my university’s authentication service.
I’ve got the snap installed on ubuntu.

Our SAML installation provides an XML configuration file to download, and expects a different XML file to be returned.
With my tests other software (mattermost for example) allow the importing of such a file, but does not as far as I can see.
What’s the usual way to integrate this information?