I'm somewhat new to LR3 and would like to know your process for uploading to mpix, or any other good print sales site. The jpegs (processed from raws) that I'd like to upload are in a Smart Collection within a catalogue, contained in many different folders on my hard drive. How do I copy those to one folder so I can easily upload them all to mpix without choosing from each hard drive folder? If I re-export the jpegs, will the files change at all? Of should I have re-exported the processed raws into a single folder? There are ~200 jpegs from a catalog of ~4000 raws in 20-30 folders, so I'd rather not have to sort them over again. Thanks,--Eric.
Just select the photos in the collection, click Export, and plug in the location where you want the JPEGs and the size and quality. You don't have to find the individual photos once they are in the collection, LR will take care of that.