I can't see connect to my network drives using my VPN

I switched my old booklive for 8TB My Cloud EX2 Ultra Network Attached Storage, this is faster that I have before, I use my own network but sometimes I connect via VPN, I have noticed when I get connected via VPN my access to network drives or sharing I can’t see them or I can;t connect. Also, I;ve realized when I connected via cell or my other connection when I try to connect via browser it says Forbidden you don’t have permission to access/ on this server, I still have connected my old book-live and I can see sharing drives using the VPN, for more details I have a router ASUS VPN Server and Openvpn in both cases I can connect, my HDD attached to router the IPs are statics
Anyone could give me a clue?, I tried many things but I’m without ideas in this time
have a great day,
PS I hope you understand what I want to express I’m almost sleepy