May 28, 2014
If you have moved folders using the operating system after importing them into Lightroom (essentially moving files behind Lightroom’s back), Lightroom will display a “?” next to the folder icon in the Folder panel. Control (Mac) / right mouse -click on the folder and choose Find Missing Folder to re-link folders that have been moved or renamed.
To avoid this in the future, simply move your images using the Folder panel in Lightroom!
November 4, 2013
To quickly create a collection from a folder of images in Lightroom, drag the folder from the Folders panel into the Collections panel. If you drag a folder that contains subfolders, it will create a single collection including all of the files in the parent folder and all subfolders.
April 12, 2012
If you skip ahead in this video to @ 4:38 (Questions about Lightroom and Photo Management), I talk about how to archive or move your images from your internal drive to an external one. As you will see, it is easiest to move the files to the new drive from within Lightroom.