ReadyShare -- External Access not working

Many ISPs will block any attempts to have an SMB share be accessible directly over the WAN, since it is seen as a major security risk, and since some users will mistakenly fail to set up their network security to ensure that none of that traffic leaves through the WAN port, especially when using routers that lack good security defaults, and instead rely on the user configuring their firewall manually (common with pfsense, and some of the ubiquiti edgerouter products. While there are many benefits to having additional controls, the major issues of poor configurations have lead to ISPs taking the steps to block such traffic for residential connections.

While you can have remote FTP access, I recommend against it as well since it is not as secure as simply relying on the VPN server for remotely accessing those network shares.

If you have ddns setup, then all you really need to do is set up the VPN server, then when you want to access readyshare and other local resources, you can simply connect to the VPN first, and then have easy access to your LAN facing resources.

If you have a separate NAS or home server, and you do not want to have to use a VPN to access them, then be sure to research all recommended ways of securing it so that it doesn't end up as part of a bot network or a foothold on your netwwork to constantly run through a vast array of exploit toolkits on every other device on the LAN.

When the device is properly secured enough to be exposed to the WAN, then forward the ports it needs (some services will need multiple ports forwarded). Also make sure the device is not behind a double NAT.