Here's an easy way to import items to a questionnaire's queue pipeline.
To import a CSV file, Log in your dashboard -> Go to Distribution Settings per questionnaire (eg After Sales and Store Pick Up) from the Homepage of your dashboard.
In the middle of page, you will find the Questionnaire Pipeline Settings.
When you click on Import button, then you will be requested to upload the relative file from your desktop.
The required data of the csv file in order to be delivered are:
responder_channel_identifier: the email or the phone number you want the questionnaire to be delivered
send time: the day-time that you wish the questionnaire to be delivered to each responder
The format of the send_time should be exactly as it displayed below
After uploading the CSV file, click save and check the queue items with status "Pending" to verify that the items are added.