@popotte93 -- converting OPENSSH key to RSA format:
--- if possible, consider converting your OPENSSH private key to RSA format. This would eliminate incompatibility issues with Flysystem v3
--- use tools like ssh-keygen or puttygen to perform the conversion
--- ensure proper permissions for the converted key file
-- exploring alternative libraries if key conversion isn't feasible, investigate alternative libraries that support OPENSSH keys:
--- phpseclib: A comprehensive PHP security library with SFTP support for various key formats
--- phpseclib-sftp: A standalone SFTP library based on phpseclib
--- league/flysystem-sftp: A Flysystem adapter for SFTP, compatible with both Flysystem v1 and v3
-- may be addressing configuration problem. Double-check your Laravel SFTP configuration in config/filesystems.php:
--- ensure correct paths to the private key and passphrase (if applicable)
--- verify other settings like host, username, port, etc
--- enable detailed logging to capture specific error messages
-- more fo debug:
--- test SFTP connection using command-line tools like sftp to isolate library-specific issues
--- experiment with different key formats (PEM, PKCS8)
--- check file and directory permissions on both local and remote servers
--- consider using an SFTP client for direct file transfers and testing