Hello Daniel,
Hello everybody,

I tried this new feature you kindly provided. Unfortunately it had no
effekt on the mode of the created file. Here is what I did. I used
Ubuntu 20.4.1 to compile the final version of curl 7.75.0 with the
following commands:

./configure --with-libssh2
make
sudo make install

and I got the following curl version without any warnings:

curl 7.75.0 (x86_64-pc-linux-gnu) libcurl/7.75.0 OpenSSL/1.1.1f
zlib/1.2.11 libssh2/1.8.0
Release-Date: 2021-02-03
Protocols: dict file ftp ftps gopher gophers http https imap imaps mqtt
pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS HTTPS-proxy IPv6 Largefile libz NTLM NTLM_WB
SSL TLS-SRP UnixSockets

I then tried to upload a file to localhost (same Ubuntu machine) several
times:

curl -k -u jojo:password --create-file-mode 777 -T Zahnpasta.txt
sftp://localhost/home/jojo/Documents/
curl -k -u jojo:password --create-file-mode 0777 -T Zahnpasta.txt
sftp://localhost/home/jojo/Documents/

The upload worked out without warnings but the file still has the 644
permissions .

What do I have to do to get this feature working?

Thanks in advance,

Johannes