Preconditions:
- Added image files under Media/Images folder.

Steps to reproduce

1. Log in to back office.
2. Go to Content / Media.
3. Start creating an Image content.
4. In richtext field input an image file to trigger image picker.
5. Being on image-picker, expand folder structure with image files or drag and drop folder within the root folder location.

Actual result:

Image files are displayed in content-tree and button 'see more'.

Expected result:

Only folder structure is displayed in content tree.