If you have products in your feed that do not have a product image and you do not want to upload them to your Shopify store, you can do the following:
1. Filter--Basic Filtering
Under the Images, you can choose if you would like to publish the products without images or not.
2. Other Options--Advanced Filtering
You can do the same here, the difference between the Basic and Advanced method only lies in the other filtering options.
Please note that Syncee will only not upload those products where there is no image URL, but this does not refer to the products where the image is inaccessible.
If you would like to know more about it, contact the support staff.