Template not found error when template file does exist I am getting a Template not found error.

Template not found error: case-studies/_category


However the template does exist (see screenshot).



I have tried clearing the template cache but still the issues perssits.

Update

I'm doing tests with other files - like image files - uploading them to the server. They are not getting picked up as existing and throw up 404 errors. 

Update - Fixed

Looks like we moved the server droplet and were uploading files to the wrong location.
_category can only be viewed if it's included in another file, because of the underscore. A twig file with an underscore cannot be loaded directly via the URL.

You may also read What is with the underscore in twig template filenames? or hidden templates from the Craft Docu.