Hello
I don't want that any registered user connected in frontend, who is allowed to add articles, can see and use all the folder and subfolders /images.
In JCE, in Editor profiles/Frontend/File system/File directory path, I recorded a subdirectory of /images, but it doesn't work.

So, what is the solution.

And it would be even better that we could allow a different folder for each user ...

Do you mean, I have to enter "images/$id", and each user will have automatically his folder created ?
Or is it necessary to create a profile in JCE for each user, in which "id" is replaced by his user ID ? (not a solution, they are too numerous).

... or I may not have understood anything ?

please see: https://www.joomlacontenteditor.net/support/tutorials/editor/setting-the-file-directory-path

6. The folder will be created if it does not exist.