You would need to use an app to capture the ftp files and map it into your store.
We provide a product data management solution whereby we can automate the ftp import of products and inventory. You can then check data and select which products you would like to sync to your store so gives you more control over what products to publish.
If you would like to discuss further just send me an email to firstname.lastname@example.org
You can check Sellbrite or Ecomdash if they fulfill your needs.
With Syncee DataFeed Manager, you can upload products from the most popular file sources like URL, (S)FTP, Google Drive, Google Docs, OneDrive, Dropbox. If you have an API or SOAP connection, you can also upload and update suppliers’ products.
You can learn more Syncee DataFeed Manager here: https://syncee.co/datafeed-manager/