Caddy reverse proxy

[ascii17]

Hello, I am trying to setup Resilio sync web interface on my NAS (Synology DS220+) behind my internal caddy server.

However when I try to point the caddy reverse proxy to the NAS (10.6.1.10 in the config below) I end up creating a 301 loop and I am not sure how to debug the issue...
Here is the CaddyFile I use:

(tinyca) {
        tls {
                ca https://tinyca.lan/acme/acme/directory
                ca_root /usr/local/share/ca-certificates/tinyca/root_ca.crt
        }
}


pihole.lan {
        import tinyca
        reverse_proxy 10.2.1.5:8080
        encode zstd gzip
}

nas.home.lan {
        import tinyca
        reverse_proxy 10.6.1.10:5000
        encode zstd gzip
}

sync.home.lan {
        import tinyca
        reverse_proxy 10.6.1.10:8384
        encode zstd gzip
}

resilio.home.lan {
        import tinyca
        handle {
                reverse_proxy 10.6.1.10:28888
        }
        encode zstd gzip
}

I have tried to fiddle with the "rewrite" function but I haven't had any luck with that...
Thank you for any help!