Magma : can't load mods or plugins

[Antaigo]

Hey ! I recently created a minecraft server in Magma in 1.12.2 and I have an issue.
To configure docker, I used a docker-composer.yml.
When I launch my server, everything is good except for the mods and the plugins.When I connect to my server neither the plugins or the mods are loaded. Yet, I put my plugins in the directory plugins and the mods in the directory mods.
Here's what I found in the logs :
[mc-image-helper] 02:47:08.882 WARN : Failed to access /plugins due to /plugins and further [mc-image-helper] 02:47:09.990 WARN : Failed to access /mods due to /mods.
And here's the contents of my docker-composer.yml :
" version: "3"

services:
minecraft:
image: itzg/minecraft-server:java8-multiarch
volumes:

• minecraftdata:/data
• /volume1/mcserver/mods:/mods
• /volume1/mcserver/plugins:/plugins
  ports:
• 25565:25565
  environment:
  EULA: "TRUE"
  TYPE: "MAGMA"
  VERSION: "1.12.2"
  OPS: "Antaigo"
  tty: true
  stdin_open: true
  restart: unless-stopped
  volumes:
  minecraftdata:
  external: true "

So, I don't understand what I did wrong.
Does someone can help me to fix this issue ?

[Antaigo]

bullet points are actually dashes