I have Incus on my local PC. I am able to add a LXD server as a remote. So far so good.
I can also incus shell into a remote instance. A generic incus ls shows all instances on the remote.
$ incus remote ls
+-----------------+------------------------------------+---------------+-------------+--------+--------+--------+
| NAME | URL | PROTOCOL | AUTH TYPE | PUBLIC | STATIC | GLOBAL |
+-----------------+------------------------------------+---------------+-------------+--------+--------+--------+
| images | https://images.linuxcontainers.org | simplestreams | none | YES | NO | NO |
+-----------------+------------------------------------+---------------+-------------+--------+--------+--------+
| local (current) | unix:// | incus | file access | NO | YES | NO |
+-----------------+------------------------------------+---------------+-------------+--------+--------+--------+
| quay | https://quay.io | oci | none | YES | NO | NO |
+-----------------+------------------------------------+---------------+-------------+--------+--------+--------+
| myremote | https://myremote.example.com:8443 | incus | tls | NO | NO | NO |
+-----------------+------------------------------------+---------------+-------------+--------+--------+--------+
$
$ incus shell myremote:unifi
root@unifi:~#
$ incus ls myremote:
+---------------+---------+----------------------+------+-----------+-----------+
| NAME | STATE | IPV4 | IPV6 | TYPE | SNAPSHOTS |
+---------------+---------+----------------------+------+-----------+-----------+
| arpwatch | RUNNING | 172.16.16.129 (eth0) | | CONTAINER | 0 |
+---------------+---------+----------------------+------+-----------+-----------+
| unifi | RUNNING | 172.16.16.108 (eth0) | | CONTAINER | 0 |
+---------------+---------+----------------------+------+-----------+-----------+
However, a specific incus list with an instance name on the remote side returns an empty list. If I pull a file from it I get Error: not found
$ incus ls myremote:unifi
+------+-------+------+------+------+-----------+
| NAME | STATE | IPV4 | IPV6 | TYPE | SNAPSHOTS |
+------+-------+------+------+------+-----------+
$ incus file pull myremote:unifi/etc/passwd /tmp/
Error: not found
