FileFlex currently supports ASUSTOR, Netgear, Qnap, Synology, and Drobo devices. However, if you have an unsupported NAS you can still access it through FileFlex if you have another connected device on the same network, such as a server or a PC.
First, select the server or PC in FileFlex, then click on "Network" in the right column.
Next, select the NAS or other device you'd like to access. You may be prompted to enter the device credentials, and then you will have access to the files on that device.
Note that if you are using a PC to network into your NAS, your PC will have to be on, not hibernating, and connected to the network in order to be able to access files on your NAS remotely.