What every compatible device has in common
Sling Photos uses the SMB protocol to discover and connect to drives. Your device needs SMB enabled, your iPhone and the drive on the same Wi-Fi network, and a user account with read/write permissions to the folder you want to archive into. That's it. No special app on the NAS side, no port forwarding, no cloud account.
Synology
Enable SMB in DSM → Control Panel → File Services → SMB
QNAP
Enable SMB in QTS → Control Panel → Network & File Services → Win/Mac/NFS/WebDAV
Western Digital
Enable SMB in My Cloud OS 5 → Settings → Network → Windows Services
Asustor
Enable SMB in ADM → Services → Network File Services → Samba
Mac with File Sharing
Any Mac running macOS Ventura or later works as a destination drive for Sling Photos. No NAS required. Enable File Sharing in System Settings and your Mac appears automatically.
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My NAS isn't listed
If your device supports SMB file sharing, it almost certainly works with Sling Photos. The listed devices are ones that have been specifically tested or reported by users. Any NAS running a Samba-based SMB service, including devices from Netgear Readynas, Buffalo, TerraMaster, and Drobo, should connect without issues. If you hit a problem, contact support with your brand and model and we will help troubleshoot and add it to the confirmed list.