The first step in doing this would be to enable the option from the Preferences section. In order to do that, kindly follow the steps mentioned below:
- Click on the Gear icon present on the top-right corner, and select More Settings.
- Under Preferences -> Items, scroll down to the Additional Information section. Select the checkboxes under Enable against SKU and Item Image to enable these additional fields while creating an item.
- Also, select the checkboxes under Show in all PDF if you wish to display these fields in the transaction PDFs.

- Click on the Save button for the changes to take effect.
Once this is done, whenever you create/edit an item, you will be able to upload an image and enter SKU information.
