I'm... not sure whether this will work because when I needed to do this I did go through the command line. However... Sisense allows access to file management of certain directories in the browser for administrators, if this is enabled in the settings.
If it's enabled in your installation, you'll find it on the Admin Tab, under Server & Hardware> System Management. "File Management" should be one of the options at the top right of the page (between 'Generate Support File' and 'Configuration".
The system administrator can turn the file management feature on or off under App Configuration > Feature Management