Files not transferring to UnRAID

I'll try to explain it as best as I can. I've tried to do this in two configurations and the files refuse to transfer to the UnRAID. I'm losing my damn mind

Config 1;
Storage: R510 running UnRAID
Docker containers: Synology DS923+
Downloads: Synology DS923+

Sonarr grabs the files, downloads to the Syno, Sonarr can see it has finished downloading. End. Nuda. Caput.
I have run the damn docker containers as nobody, root and my main user PGID and PUID

Config 2;

Storage: R510 running UnRAID
Docker containers: R510 running UnRAID
Downloads: Synology DS923+

Again, grabs, downloads, twiddles it's thumbs.
Again I have run the containers with various PUID and PGID values.

Nothing. Bloody. Works.

Please, for the love of my sanity, someone help