I have already in Include_Mimetype.php such information. I have there:
".tiff" => "image/tiff",
".tif" => "image/tif",
But i still get the message for the tif and tiff images:
image/tiffimage/tiff File format not allowed!
image/tiffimage/tif File format not allowed!
Please tell me how i could change Include_Mimetype.php to make it possible to upload tif and tiff images