Drag and drop files to FileManager sends two requests to the server

[kendo-bot]

Bug report

When dragging and dropping a file into a specified FileManager folder, the Upload request triggers twice.

Reproduction of the problem

1. Open the FileManager Demo: https://demos.telerik.com/kendo-ui/filemanager/index
2. Open the browser's Network tab.
3. Drag and drop a file into the FileManager.
4. Two Upload requests are triggered one after another.

Expected/desired behavior

When uploading a single file with drag & drop, a single Upload request must trigger. When using the default upload button to upload a file, a single request triggers as expected.

Environment

• **Kendo UI version: 2024.4.1112
• **jQuery version: 3.7.1
• **Browser: [all]