You can send PDF files in Facebook Messenger. But you will need to send it from Google Docs or Google Drive app on iPhone or Android. To send a PDF file using Facebook Messenger, make sure you ...

To view a PDF file on your Kindle, you must first transfer it to the reader. To transfer the PDF file, you must email it to your Send-to-Kindle email ID.

The only way a PDF file can become editable is if you use Send to Kindle. The Chrome extension, email and the app for PC or MAC are perfectly fine, but they do have a 25MB limit in PDF files.