File needs to be import, and it must be either .csv or .txt
Contacts will be import into the selected list
If "Skip", then the existing contacts will be skipped while import; Otherwise the existing contacts will be overwrites
If HTML, then the contacts will be received the "HTML" content of the broadcast; otherwise "Text" content'
Contacts will be considered as "Active" or "Inactive"
Contacts will be considered as "Confirmed" or "Unconfirmed"
Contacts will be considered as "Subscribed" or "Unsubscribed"