I can't see my external HDD files

Hi.
I have a HDD connected to a router
I installed Serviio (free version) for Windows on my PC to share the files between the HDD and the TVs or others devices.
I added the folder into the Serviio library, but when I try to see any movie o file from my TVs or even the cell phone, I can't see nothing.
Could you help me? Why I can't see my external HDD files?
I can see all the folders and files if they are accessed from my PC's explorer or even from my cell phone (using ES File Explorer), so the net and the HDD are working fine.
If I take some movie to my PC and I share it through serviio I can see it and play it.
I have a HDD connected to a router
I installed Serviio (free version) for Windows on my PC to share the files between the HDD and the TVs or others devices.
I added the folder into the Serviio library, but when I try to see any movie o file from my TVs or even the cell phone, I can't see nothing.
Could you help me? Why I can't see my external HDD files?
I can see all the folders and files if they are accessed from my PC's explorer or even from my cell phone (using ES File Explorer), so the net and the HDD are working fine.
If I take some movie to my PC and I share it through serviio I can see it and play it.