When attempting to add a BYON location with a private key file through the GUI, the generated YAML file is improperly formatted and results in the following error when the user tries to save:
ERROR Invalid YAML: while scanning a simple key; could not found expected ':'; in 'reader', line 12, column 1: vfyF2M3xG3z5MUPuqeCveLhkI/1t26mW ... ^
The location can only be added after the user manually fixes the formatting in the YAML editor view.
Here is a comparison of generated vs. manually fixed: https://gist.github.com/mikezaccardo/34ea0c38b232bf125a059f1b1913c486
^^ Note that the private key is a harmless / throwaway from a Vagrant box.