How can I stop the uploading process?
Unfortunately, if the products are already in the queue, you’ll have to cancel the uploading process.
But if the products are not in the queue yet, you can go to
Add Products (CSV) page and click “Manage” for the CSV if you want to stop the uploading process.
Then click the “Unpublished” button.
All products that aren’t in the queue yet won’t be uploaded.