How to access files transferred to device using SimpleSSHD?

Don't ever copy files out of /sdcard/, for this task you should leave the files where they are. In order to copy files using SimpleSSHD, simply connect and copy: assuming you've left the default port of 2222 you can do this,

SCP File Transfer

host=192.168.1.228

scp -r "scp://root@${
host
}
:2222//sdcard/DCIM/OpenCamera" .

RSYNC over SSH File Transfer

host=192.168.1.228

rsync --progress -ave 'ssh -p 2222' "root@${
host
}
:/sdcard/DCIM/OpenCamera" .