Permission denied when trying to add data source path for local folder

Hi all,

Such a simple issue. Looks that Grafana only accepts my raspberry pi’s /opt folder for local data source. I would prefer to use something like connected usb stick and folder there for my data source. When I try to set data source folder for my .csv file location to usb stick located folder, I get “Permission denied” error message. When I set data source folder to /opt folder, no problem.
Yes, I have set all the permissions for the folder and even tried setting owner and even group owner to “grafana”, but no help.

Best regards,
Olli

It depends how you configured your OS, installed Grafana, …: e.g. SELinux rules may block access, your Grafana is reaching some limit of open files (filedescriptors), …