Folders not shown

[RCS11]

Best reader,

I've installed VLC for Ios (version 3.0.2 (303) on my ipad. (IOS 11.2.6).
In my homenetwork I've a Synolygy NAS and a raspberry pi3.
With my Laptop (running Windows 10) I can see every folder/file on both of them, but when i'm using VLC for ipad i can see evrey file on my NAS but on the Raspberry i can only see the 4 mainfolders but nothing else... For example; when i connect to my Raspberry, I can see [osmc] [REVOVERY] [Series] [SETTINGS] but when i select [Series] there is nothing in it....And in Windows Explorer i can see 28 folders.

Hope u can/will help me.

Best regards,
RCS11