Split Dns with with 2 Wan and manual outbound nat

[Nitram74]

Hi, i'm using pfsense with 2 wan (normal internet and one for vpn) with manual nat. all ip from internal network devices are going over the vpn interface out into internet. I have a internal cloud device and i like to access this from outside and inside the knternal net over the dyndns name. I tried a lot but it does not work, any ideas? Thanks and reagards Nitram