Now add all your .csv files contacts to ContactBook by drag and drop your .csv file.
Step 1: On your PC Go to ContactBook, And Log In with your account.
Step 2: Click on Import Contacts > Upload .csv file or Drag & Drop your .csv file or Click on Settings > Import Contacts > Upload .csv file or Drag & Drop your .csv file.
Step 3: Find and Select the .csv file from your device and Double Click on it. (Upload It)
Step 4: Now .csv File Contacts are Imported so you can start managing your contacts by clicking on Contacts.
Step 5: Yah! Your .csv File Contacts are imported to ContactBook. And, Ready to manage and share with others!
Note: Check the Space before importing Contacts If you are using Multiple Spaces.