You can see it in the video I posted.
First method (in the video):
curl -X POST localhost:8080/admin/schema --data-binary '@./dgraph/schema.graphql'
It is worth noting that I HAVE received errors using this method in the past, but there have been times when I have also not received errors (as shown in the video)
Second method:
Wrote a script to load my schema file, start an apollo client, and run the updateGQLSchema mutation at /admin