I did this

1. Get Apache SSHD 2.2.0 from https://mina.apache.org/sshd-project/
2. Launch Apache SSHD

  cd apache-sshd-2.2.0/bin
  ./sshd.sh

3. Upload file to our Apache SSHD server

  curl sftp://localhost:8000/~/TestUploadFile --insecure --upload-file ~/TestFile

Result:

curl: (79) Error in the SSH layer

curl output with --verbose

But upload it is working fine with parameter --append.

curl/libcurl version

23c99f6

curl 7.66.0-DEV (x86_64-pc-linux-gnu) libcurl/7.66.0-DEV OpenSSL/1.1.1c zlib/1.2.11 libssh/0.8.7/openssl/zlib
Release-Date: [unreleased]
Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: AsynchDNS Debug HTTPS-proxy IPv6 Largefile libz NTLM NTLM_WB SSL TLS-SRP TrackMemory UnixSockets

operating system

Debian GNU/Linux 10