Instructions
Navigate to the Form Center module:
Click the Modules menu
Select Content
Click the Form Center
Select a category:

Locate the form whose submissions you want to import:

In the Submissions column, click the number of submissions:

Click the form's Actions button:

Select the Import option:

On the pop-up modal, click the Choose File button:

Note:
The imported file must be a TXT or CSV file and have its results delimited by commas or tabs.
Select the TXT or CSV file you want to import:

Click the Open button:

Click the Import button:

Click the Done button on the pop-up status modal:

Note:
If the form is imported correctly, the message reads "Data imported successfully".