I can generate thumbnails in CentOS by installing unoconv libreoffice-headless vlgothic-fonts ImageMagick.
However, I can’t generate thumbnails of PDF and MS Office files. Image files such as BMP, JPG is OK. I have installed Libreoffice, Imagemagick and convert command is running in terminal. What am I missing?
BTW, There is no English manual for https://fess.codelibs.org/ja/13.2/config/thumbnail.html
Thank you in advance.