The file format must be either .xlsx or .csv.

Make sure that the file name does not contain any special characters or spaces.
Please limit the file name length to 50 characters or less.
​Pro Tip: For the best results include header names in the first row inside the file

Steps to Upload:

Create a New Group or select the Groups & Contacts tab

Click your Group Name if selecting from the Groups & Contacts tab

or

Click Add New Contact. In the popup that opens, select

Click Upload File with Contact Names.

Select Click Here To Select Your File. Find and select the file that contains your contacts on your computer.

Click Next. Name the columns in your uploaded file (Last Name, First Name, Phone Number, Email Address). Click Import.