> if (index(".pdf.jpg..."),"."++file.type(dropped)>= 0) do
should be
if (index(".pdf.jpg...", "."++file.type(dropped)) >= 0)
> if (index(".pdf.jpg..."),"."++file.type(dropped)>= 0) do
should be
if (index(".pdf.jpg...", "."++file.type(dropped)) >= 0)