In the Share window, I can enter the names/email addresses of the individuals with whom I'd like to share a folder or a file. However, there isn't an option (as far as I can tell) that allows me to select one of my secondary email addresses to share the folder/file from. This is important in my use case because I use the same Dropbox account for my personal files, work files, and some hobby files that I frequently share. Each of those three use cases (personal, work, hobby) has its own email address, so it would be great when I'm sharing a work file if I could share it using my work email address instead of my personal email address. I'd prefer it if I didn't share my personal email address with my professional work contacts (clients, colleagues, etc.).