My photos are on a Network drive. I created a Catalog on my computer hard drive of these photos. When I later open the catalog, Lightroom says that file cannot be found. Do photos have to be on computer hard drive and not a network drive before catalog can find them?
"Cannot be found" indicates Lightroom does not know the location of the photo because it has been moved, deleted or renamed outside of Lightroom.
To fix the problem, follow these instructions: http://www.computer-darkroom.com/lr2_find_folder/find-folder.htm
Photos can be on a network drive.
Not sure what I did, but found the missing photos as described in link you provided. Thanks.