@AlbertoG97
It's possible that as a guest in the workspace, you might have certain limitations on the types of files you can upload. However, the ability to upload different file formats like markdown or txt usually depends on the platform's settings or the permissions granted to your user role.
If you believe you should have the ability to upload markdown files, I would recommend checking with the workspace administrator to ensure you have the necessary permissions. They can also verify if the platform supports markdown file uploads and adjust your access level if needed.
If you need further assistance or if there's anything else I can help you with, please let me know!