Pregunta retos hacking ctf - autonomic

HELP, I am presenting the hackin ctf challenges, which are requirements for Autonomic, I have it developed and documented, Autonomic asks me to upload them to GitLab but when creating the new file it does not give me the option to upload a .docx document
Thank you

https://gitlab.com/fluidattacks/writeups/wikis/Submission

Not docx allowed. Git, CLI, etc.