Hello Pierre

- user needs to login.

You can do this by making pages "protected". Then only users or a group of users can access these pages. You canusea login object, and direct users to the locked-page area.

- Download files.

You can use the download object on a protected page. This way it is only users that are logged in, that can download the files. You do not need the download object - you can just make a link to the file you want them to be able to download.

See eventually this post : https://helpcenter.websitex5.com/es/post/191048

- Upload files.

For the uploading you have to use special code. You could also use the free member-system ADMIDIO.

https://helpcenter.websitex5.com/es/post/191048

With this free system, you can create users, and give these users access to upload and download.

You can integrate it on your pages via iframes. You can see a demo here : https://www.admidio.org/demo_en/adm_program/modules/announcements/announcements.php

Kind regards

John S.