Hi @huzanforbes,
Thank you for using Bitnami. The Magento's files are configured to be owned by daemon, this way the application can be updated or you can install any extension using the app's dashboard. In case you want to modify any file inside the installation, you will need to use sudo.
In this case, you can copy the new .html file to the home folder of the user, and then move it to the proper folder
sudo mv ~/huzan.html /opt/bitnami/apps/magento/htdocs/huzan.html
Finally, please run these commands to set the proper permissions
sudo chown daemon:daemon -R /opt/bitnami/apps/magento/htdocs/
Happy to help!
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