The image upload is a feature of the pro-version: https://q2apro.com/plugins/sceditor/
It comes with:
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.