how to change directory to store the images

[arr111]

I have docker compose as below

version: '3'
services:
nginx:
image: nginx:latest
container_name: nginx
volumes:
- /opt/nginx/conf:/etc/nginx/conf
- /opt/nginx/logs:/etc/nginx/log
- /opt/nginx/cache/:/etc/nginx/cache
- /opt/nginx/letsencrypt/:/etc/letsencrypt/
ports:
- 890:890
- 4243:4243
restart: always

pigallery2:
image: bpatrik/pigallery2:latest
container_name: pigallery2
environment:
- NODE_ENV=production # set to 'debug' for full debug logging
# - NODE_OPTIONS=--enable-source-maps # enable source map support on the backend for development
volumes:
- /opt/pigallery2/config:/app/data/config # CHANGE ME
- "db-data:/app/data/db"
- /opt/pigallery2/images:/app/data/images:ro # CHANGE ME, ':ro' means read-only
- /opt/pigallery2/tmp:/app/data/tmp # CHANGE ME
expose:
- "80"
restart: always

volumes:
db-data:

dir default is /opt/pigallery2/images:/app/data/images

I want to replace /opt/pigallery2 /images with /mnt/sda1/images

every time I change it, the photo is in the /mnt/sda1/images directory.

images are not detected, did I set it wrong?

sorry, this post was made by translation
I hope you understand
thanks verry much

[bpatrik]

Not sure If I understand, but I think you need change:
- /mnt/sda1/images:/app/data/images:ro