I'm at the very front end of this process mapping, so i'm looking at a variety of options.
I think that i'll be receiving images from people in either LR catalog or just image files, depending on their level of experience with LR and how they manage their files. I want to be able to detail a couple of processes to my clients depending on what they are comfortable using.
I'm not sure if there is best practice for receiving files to be edited for someone else...
To transfer back, i'm thinking either FTP or a file sharing service. Not quite made my mind up on that yet.
From what I know, a lot of these services take shipped drives with a catalog of images that they work. With the low cost and weight of SSD drives these days, it's very manageable. Clearly the SSD is copies of the original files for safety.