mendelson OFTP2 - Is it ideal for my business?

Good morning, my company has a client who needs to send files and asked if we had set up OFTP. They just say they use this protocol for file transfer, so we have no alternative. This client has already sent us all the necessary data to establish the connection (Host, IP, Port, SSID, SFID, password, etc.).
In the partner configuration I already configure all the things, and when I made "Test connection" everything is correct (all green).

Now what is the next step? How my client send to me files?

Thank you!