Unable to set my Private key

[Milliways]

I am using the latest Filezilla on macOS 10.13.6 and in Configuration wanted to set my Private key for SFTP.

This is stored in ~/.ssh but Add Key File DOES NOT SHOW hidden directories.
There seems to be no way to manually enter the path.

[botg]

Standard Mac functionality:

You can press highway-interchange + shift + . to show "hidden" files

You can press highway-interchange + shift + G to open the go-to dialog, or simply press / or ~ to achieve the same with these letters already filled in.