Channeladvisor/Amazon FTP migration to Shopify

We currently sell on Walmart, Amazon and use Channeladvisor. We would like to switch to Shopify. Currently we have 3 FTP files that are being pulled into Channeladvisor daily. The FTP file data is not the final data and needs several adjust,ents before it is ready to be sent to Amazon. We need an app built that can take the FTP file data adjust it and then send to Shopify , Amazon.

We also need to pull all our data from channeladvisor and upload it to Shopify. Reply with FTP so I know you read this.