Docker secrets file not getting copied in containers

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This is the YAML file with Secrets details:

version: "3.1"
services:
  mydb:
    image: mysql
    ports:
      - 3306:3306
    volumes:
      - my_db:/var/lib/mysql
    environment:
      - MYSQL_ALLOW_EMPTY_PASSWORD=Yes
    networks:
      - swrm
    deploy:
      replicas: 3
      update_config:
        parallelism: 2
        delay: 10s
      restart_policy:
        condition: on-failure
        delay: 10s
        max_attempts: 2
        window: 120s
volumes:
  my_db:
networks:
  swrm:
secrets:
  username:
    file: ./username.txt
  password:
    file: ./password.txt

I created a stack using this command:

docker stack deploy -c <yml_file> <stack_name>

I can see 2 new secrets getting created once the stak deploy is completed using this command:

[root@ip-172-31-45-243 docker-stack]# docker secret ls
ID                          NAME                CREATED             UPDATED
7na4q2z59ffddly3078l78rde   testing_username    8 minutes ago       7 minutes ago
vf575nhjmlpn15fauov0dqqda   testing_password    8 minutes ago       7 minutes ago

But when I login to the containers started by the stack (using exec), I am unable to find secrets folder inside /run.

Please let me know how to fix this issue.