Drag and Drop Multiple File Uploader by Glen Don L. Mongaya is a WordPress plugin extension for Contact Form7, which allows the user to upload multiple files using the drag-and-drop feature or the common browse-file of your webform.
File Type Validation
File Size Validation
Limit number of files Upload.
Limit files size for each field
Can specify custom file types or extension
Manage Text and Error message in admin settings
Drag & Drop or Browse File – Multiple Upload
Support Multiple Drag and Drop in One Form.
Able to delete uploaded file before being sent
Send files as email attachment or as a links.
Support multiple languages
Cool Progress Bar
There are details and a Pro version demo at: https://www.codedropz.com/contact/