IOx containers are secure, so adding or changing files to them is difficult to do. However, it is relatively easy to get files from the containers.
IOx provides a lot of capabilities via the "ioxclient" command, however this is rather cumbersome for development. During development its common to make some changes and need to save the files, something like a Node-RED flow. Here's an example of how to access the container filesystem from the GOS to get the default Node-RED flow:
scp -P 2222 root@192.168.11.26:/software/caf/work/repo-lxc/nr/rootfs_mnt/root/.node-red/flows.json .
In this case, the application is "nr" (i.e. Node-RED). You can see it using ioxclient app li:
$ ioxclient app li
Currently active profile : NA-X01N
Command Name: application-list
Saving current configuration
List of installed App :
1. nr ---> RUNNING
2. dm900s ---> RUNNING
Or, if you've shared SSH Keys, ssh with virsh:
$ ssh -p 2222 root@192.168.11.26 virsh list
Id Name State
----------------------------------------------------
8298 nr running
10078 dm900s running