I've been tinkering with this local file folder option, and I've noticed two things. Note: my system is vanilla 10.04 with all online updates.
(1) Thumbnail preview preference alterations on any file folder will affect all of them, globally. You cannot change preferences for a subset of folders only. (2) The option to preview thumbnails only for files below a certain size does not work at all. Whatever you attempt to specify in it, the system will either preview thumbnails for all files or for none, irrespective of size. -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/