Persistent volumes with docker-compose and RStudio/Jupyter

I am trying to create an RStudio instance and a Jupyter Notebook instance using docker-compose building an image. I can create these instances but the volumes mounted do not seem to be "persistent".

Below is the tree structure of my folders:

.
├── Docker
│  ├── docker-compose.yml
│  └── Dockerfile
└── R_and_Jupyter_scripts
    └── files_already_there.txt

I would like:

1) The files_already_there.txt to be available in my RStudio and Jupyter Notebook instance.

2) That any new file/script created from one of the two instances appears in the R_and_Jupyter_scripts folder with read/write permissions. i.e: I created a textfile "output.txt" from the RStudio instance but when I check the path, here is where the file is saved:

sudo find / -name "output.txt"
/var/lib/docker/overlay2/821d3d087948309e3c489af29a5263e53e5f72627e903b4285a9597214412840/diff/home/maxence/output.txt
/var/lib/docker/overlay2/821d3d087948309e3c489af29a5263e53e5f72627e903b4285a9597214412840/merged/home/maxence/output.txt

Below is my current docker-compose.yml, can you identify what is wrong?

version: "3.5"
services:
  rstudio:
    environment:
      - USER=maxence
      - PASSWORD=password
    image: "rocker/tidyverse:latest"
    build:
     context: ./
     dockerfile: Dockerfile
    volumes:
      - /home/ec2-user/R_and_Jupyter_scripts:/var/lib/docker/
    container_name: rstudio
    ports:
     - 8787:8787

  jupyter:
    image: 'jupyter/datascience-notebook:latest'
    ports:
     - 8888:8888
    volumes:
      - /home/ec2-user/R_and_Jupyter_scripts:/var/lib/docker/
    container_name: jupyter

Thanks a lot.