internal static string UploadPdfPath(string bookFolder)
{
// Do NOT use ChangeExtension here. If the folder name has a period (e.g.: "Look at the sky. What do you see")
// ChangeExtension will strip of the last sentence, which is not what we want (and not what BloomLibrary expects).
return Path.Combine(bookFolder, Path.GetFileName(bookFolder) + ".pdf");
}