CoreUpload v5 . ASP.NET Core 8+
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Drop Overlay

A styled overlay appears when files are dragged over the drop zone. Customize the overlay message and appearance.

What you should see: an overlay that appears across the drop target as soon as a drag enters the window, and disappears on drop or leave — so users can see where the file will land.
<upload-dropzone asp-upload-url="/api/upload/upload"
 asp-multiple="true"
 asp-drop-overlay="true"
 asp-drop-overlay-text="Release to upload your files"
 asp-auto-upload="true"
 asp-progress="true">
</upload-dropzone>

The overlay is part of full-page drop

With asp-full-page-drop on, dragging a file anywhere over the page raises an overlay showing where it will land. It is not a separate layer to enable — it is how full-page drop makes itself visible, which matters because a page-wide target has no boundary of its own.

Write a caption that says what happens

asp-drop-overlay-text sets it. Something specific to the page — “Drop invoices to attach” — tells the user what the drop will do, where a generic prompt only confirms that something will happen.