QuickBooks Online doesn't offer a native FTP option for data import, so you'll probably need a 3rd party tool to import data directly from FTP
One option is Skyvia. It is a no-code platform that allows you to connect to your FTP server and then import data into QuickBooks Online. You can find instructions on their site
Similar functionalities are offered by platforms like Zapier Workato or MuleSoft. The later one offers wider functionality but is more complex in general.
Feel free to ask if you need clarification.
