There are 2 ways you can add a photo of your product - directly through Barcode Manager or use GS1 Picture It!
To add a photo to a product in Barcode Manager, login to your Barcode Manager account and go to ‘My Products’ on the Product Manager menu or View Products on the dashboard.
Click on the product you would like to add a photo to and this will open the Edit Product page. Here you can edit any product details entered previously. To add a product image click on the Picture tab. 
Drag and drop your image into the blue Upload area or click on ‘click to open’ to select an image from your computer.
Click on update to save your changes.
If you are sharing your product data with Verified by GS1, the photo will be sent to the registry platform along with the basic product attributes.
If you want more information about GS1 Picture It! you can read about it in our articles Why should I use the GS1 Picture It! app?, Getting started with GS1 Picture It!, and Using GS1 Picture It!