Ironically my Changes don’t work even if i reboot the server.
#-------------------------------------------------------------------------------------# Attachment
#-------------------------------------------------------------------------------------
#-# [Since 5.2M2]
#-# Define the kind of attachment that can be displayed inline. You can either choose to do it through a whitelist (only
#-# the mimetypes defined in this list would be displayed inline) or a blacklist (every mimetype that is not in this list
#-# would be displayed inline if possible)
#-#
#-# By default we use the following whitelist (coma separated list of values).
attachment.download.whitelist=audio/basic,audio/L24,audio/mp4,audio/mpeg,audio/ogg,audio/vorbis,audio/vnd.rn-realaudio,audio/vnd.wave,audio/webm,image/gif,image/jpeg,image/pjpeg,image/png,image/svg+xml,image/tiff,text/csv,text/plain,text/xml,text/rtf,video/mpeg,video/ogg,video/quicktime,video/webm,video/x-matroska,video/x-ms-wmv,video/x-flv,text/os