A PDF opens in the browser's own PDF viewer, inside the drop page.
A .pdf opens in the browser’s built-in PDF viewer, so search, zoom and page thumbnails work the way the reader is used to. The viewer loads the file in byte ranges, so a long document starts showing before it has finished downloading.
jalco-drop report.pdf
jalco-drop -p hunter2 -e 7d contract.pdf
Download in the ... menu saves the original file.