If you from the WebClient can select Scan Library Files then you are the owner, and when said, the path you referred towards, indicates a QNAP
As such, and if so, then @ChuckPa was 100% correct here:
It’s all in the QNAP FAQ Q14 so you need to create a new share, and name it like medias and then using the FileStation move your medias into the new share
