Hi. I am using a hAP ac2 as a second router to segment my network (NetworkMap.png)
I have added a route to my main router in order to access my NAS (route.png). When I am connected to the first router, I am able to access to the 2 Mikrotik Interfaces (192.168.1.11 and 192.168.88.1) but I am not able to reach the NAS (192.168.88.21). I have to connect to the Mikrotik Network in order to access the NAS interface. This is my Quick set (Mikro1.png). Even I have added a NAT entry (Mikro2.png)

Where is my mistake?

The problem was the firewall. Although I have disable it on the quicket main page, it was enabled..