With the File Browser widget you can list files from different sources and display them as a browsable tree.
Path
Select the base folder from:
Custom - Select a custom folder from the root of the WP installation.
Media Library - Select files directly from the Media Library.
Taxonomy - Select a Taxonomy associated with Media and use it as a folder.
Post Media - Show all files uploaded to the Media Library from the current post.
Ordered by name (ascending or descending), filtered by:
Extension - Show only specific file types, separated by comma (e.g. pdf, doc, txt).
Empty folder - Remove empty folders from the list.
Resized Image - Ignore WordPress image thumbnails.
File Info & Metadata
Icon - File type icon, or image preview for Media Library files.
Title - Automatic from filename, from Media Library, or custom.
Description - Automatic from Media or custom.
File extension - Automatic from the file.
File Size - Automatic from the real file size.
Download counter - Tracks download count per file.
Show WP Caption - Display Media Caption as description (Media Library and Post Media).
Manage Custom Titles - Opens a dialog to set custom display titles for files and folders. Available when Path is set to Custom.
Search Form
Instant search filter by file title.