If you sell on Amazon, you shouldn't rely on Amazon to build product data in Sellbrite. Amazon restricts what data it makes available to download, due to copyright restrictions on things like descriptions and images, as well as other limitations in Amazon's API.
What data Amazon does provide
When you import a listing from Amazon into Sellbrite, you'll get:
SKU, ASIN, price, quantity, condition, and condition note
The main product image
When available: brand, manufacturer, model number, dimensions, weight, and UPC/EAN/ISBN
What data Amazon does not provide
Product descriptions written by you (otherwise, descriptions are copyrighted by Amazon)
Product features, also known as bullet points 1 through 5
Additional images and high-resolution images
Restock date, handling time, sale price, and search terms
What this means for you
Since Amazon withholds this data, you'll want to maintain your own product descriptions, features, and images elsewhere, such as in Sellbrite's product catalog, rather than depending on what you can pull from an existing Amazon listing. This helps make sure your listings stay complete and accurate if you ever need to republish or move them to another channel.