To import product images, navigate to the BuyNow module and select "Setup -> Import" from the admin menu:
Step 1: Select the "Product Import" tab
Step 2: Choose a File
From the Import Products tab click the Browse button.
Step 3: Select a File Name
Navigate to the excel file you want to import, and click Open.
Step 4: Import Type
Select the Product Images Import Type from the radiobutton list.
Step 5: Import Now
To import the selected spreadsheet, click the Import Now button to upload the file
When the import is complete, a message stating that the import was successful is displayed.
Note that this process may take several minutes, depending on the number of records to be imported. You should also allow time for the data to be processed: for example, it should take about half a minute to import 100 records, five minutes to import 1,000 and so on.