How to upload files from Synology

I am new at this, I already installed Nextcloud AIO in Synology NAS but discovered i can’t see where the file directory is. I wanted to upload files to it but when i select the upload button it connects to my macbook file directory not my Synology file directory. This is code i used to install the Nextcloud AIO:

docker run -d --name=nextcloud-aio-mastercontainer
-p 8080:8080
-v /var/run/docker.sock:/var/run/docker.sock:ro
-v nextcloud_aio_mastercontainer:/mnt/docker-aio-config
-e APACHE_PORT=11000
–restart always \