When the list of files to upload is ready, click “Upload”.
You will see uploaded files with “Uploaded” status opposite them.
If you click “Cancel” while the files are being uploaded, the files that are not uploaded yet, will not be uploaded at all. You will see “Error” status opposite them.
Click “Done” to finish uploading and return to Document Library.
Virto Bulk File Uploader allows users to maximize Uploader window to the size of pop-up window.
And maximized look: