If you use a particular cryptographic key/identity instead of a password to authenticate with your server, you can import that key into Transmit.
Keys stored in your ~/.ssh folder will be used automatically if you leave the password field blank for the favorite.Keys located elsewhere may be imported.To import a key file for use with a Transmit favorite:Edit the favorite in the favorites editor
Choose Favorites > Import SSH Key File...
Locate the key file using the file browser
Click Choose Key File
Alternatively, a key file can be dragged directly to the icon.