The grffile package is already included, in: [[help:org-latex-default-packages-alist]]
The text above is an Org hyperlink describing the "org-latex-default-packages-alist" variable. However, grffile, as it is included, doesn't have any options (this is indicated with the empty quote-unquote next to the "grffile"). So, for now, in your LaTeX document, do: #+LATEX_HEADER: grffilesetup{} ... and insert the options for grffile between "{" and "}". For example: #+LATEX_HEADER: grffilesetup{filenameencoding = utf8, space} I'm also not a programmer, but I did notice this odd behavior. :)