I use an app called Codisto to import Amazon orders.
I only import FBM orders, but you can set to import FBM or FBA.
I think you should try the Zonify app. Zonify, which is released by the Importify team, is an important tool for all Shopify e-commerce administrators to definitely raise sales, save wasted time and energy by providing Amazon Dropshing. With Zonify, you are enabled to import all of the best products in an instantaneous way from Amazon, a big marketplace, with just several clicks. On top of that, this application can semi-automate your fulfillment process. Conveniently, you are able to import your products with Zonify following a few steps starting with entering the Amazon channel, and then, using the available Zonify Chrome Extension to find out the best products. To finish, you just need to click the “Add” button to put them in your store. Additionally, before importing them, it could be convenient for you to edit the information on products, like images, titles, variants, and of course, the description also. To get an order fulfilled, you can click on the Zonify icon, choose the order and you will be instantly redirected to the product page on Amazon. Click “Confirm & Pay” to get the checkout done. Make it all easier now with Zonify, it’s all in your hands!
Below are some highlight features that I think will interest you:
You can get the app here.
Hope this helps!