Hello,

Don't worry; I'll help you out. If you're unable to find all your downloaded documents, here are steps you can follow:

1. You can check your phone's file manager or downloads folder.
2. You can check any ebook app or PDF reader and see whether the book is listed or not.
3. Use the search option to search the downloaded PDF.
4. You also check your browser's history or browser's download folder to check whether the file was downloaded or not.