Drag and Drop Documents is an extension designed to boost efficiency when uploading documents to VTiger. It allows the user to simply drag and drop file anywhere on the screen and the file is created as a document and linked to VTiger record (one that file was dropped on).
How to Mass Upload Documents
Select the multiple files and Drag and Drop them into the VTiger record. It will then automatically upload the files under the Documents.
Here you can see All the Files that has been Dragged and Dropped in the VTiger record.