Pages/Workers not picking up NextJS .env vars

I'm trying to deploy a NextJS-based Page (+ route handlers which iiuc are deployed as Workers), and it doesn't seem to be picking up my

.env

.env

vars. It only works if I input them manually into the dashboard. Weird because the build logs always says it pulls in

.env

.env

. Do I need to use

.toml

.toml

.toml

.toml or something?