Question about AVM FRITZ!Box 3490

I have now tested this and it works perfectly. So it is possible to connect a Synology NAS to this Fritzbox 3490, which in turn is connected to the UPC Connect Box (Bride Mode). Tip: If someone wants to access the NAS externally under these circumstances, this works best with Open VPN.

Does anyone here have an up-to-date answer to this question? The goal would be the following sequence: UPC Connect Box in Bridge Mode -> FRITZ!Box 3490 -> Synology NAS with external access. Presumably this was also the aim of the questioner @Kuppi1990? I would be very grateful for an answer.

Well, it worked quite well for me in the potforwarding mode... But I didn't have it like this for very long. That's why I can't say 100% that it works like this with the current firmware.