You will need to use this transaction CSV template to upload your file.
Below are the required fields in order for the import to work.
Street address must exist
Status must be in the list of statuses Brivity Statuses of Coming Soon, Active, Pending, Closed, Archived, or Expired
Description must not be greater than 2500 characters
PropertyType must be in your accounts list of Brivity Property Types
List Date is required for Listings
MLS numbers are required (to bypass, add 000 or a fake number if there Isn't one)
Closed properties require a Closed Price and a Closed Date.