Private folder and files
The Private folder is a dedicated place for the configuration files that are important to your project’s development.
You can find the Private folder in the Left panel -> Assets manager -> Uploads section.
To upload your private files, click on the “+ button” or drag the files to the “Drop files here” area in the Private section.
The private folder unlike the Public folder will accept only editable text files with the following extensions: txt, xml, json, js, css, env, yml, yaml.
For example the Private folder is the place where you should add files such as the next.config.js file.

Updated on: 09/06/2023
Thank you!