Attach multiple files to send outlook messages

Guys! Apologies if my question is basic. When you can attach multiple items just by configuring the path using “Attach files” under send outlook message activity, why do we have to try all these? Am I missing something here? I know once the robot runs where the output file will be saved. I can just configure the path/create a new folder. Can you please help me understand this? I actually configured two file paths and tried sending a mail and it picked it.