Add a Folder to an ImageField
The IMCE for FileField module suits your use case. The description given in its project page is the following.

IMCE for FileField allows users to select files from IMCE File Browser. It supports FTP uploaded files by automatically registering them as IMCE files thus making them usable in a FileField.


The latest stable release (7.x-1.1) has been released on April 8, 2015. It's covered by the security advisory policy. The development snapshot for that release has been last update on August 11, 2017.
As of today (April 10, 2021), there are 5 bug reports still open; the older of them has been opened almost 7 years ago. Only one of them got a reply from the project owner, who is also the only project maintainer.