These steps will help you set up your pdfRest PDF Forms Pro Self-Hosted service to share an EFS volume with the pdfRest PDF Toolkit instance, allowing you to share uploaded files between both services.
sudo mkdir -p /mnt/efs
echo "EFS_DNS_NAME:/ /mnt/efs nfs4 _netdev 0 0" | sudo tee \
-a /etc/fstab
sudo mount -t nfs4 -o \
nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport \
EFS_DNS_NAME:/ /mnt/efs
chown ec2-user:ec2-user /mnt/efs
chmod 777 /mnt/efs
sudo systemctl restart docker