Hi,

imho your sftp, which is the only one id like to use from that bunch of supported methodes. is done wrong. You select certificate mode and then you are forced to open a file, no that should be done in a way that you press a button that will generated a certificate stores it internally in the app and ideally dont lets it export at all, then you select it and it copies the public key string ( eg ssh-rsa AAA...=) to the clipboard.

So its

1. easier to use
2. more secure, every app should use its own cert
3. dose not do stuff the wrong way around, otherwise users would put there certs to shared storage, import and forget it and then every app can read and abuse it//

thanks in advance

ps: you could still keep supporting the old import cert way but mark it as not recommended...