How to Set Up Transmission Configuration using Public SSH key from Bank for H2H connection

Summary:

How to Set Up Transmission Configuration using Public SSH key from Bank for H2H connection

Content (required):

We're setting up a first-time connection to a new bank for H2H payment processing and statement retrieval. I've created the transmission configurations using Secure File Transfer Protocol for Static File Names and Secure File Transfer Retrieval Protocol for Static File Names, and provided the bank with the SSH public key file for our environment. In turn, they've sent us their SSH public key, along with the other connection details. I'm unsure how to proceed - I've uploaded this to fin/payments/import, it has less than 26 characters and no spaces or underlines, but it's not available to select in the "PGP