NOTE: Amazon does not allow sending files to the Kindle for PC app.
Only iPad, iPhone, Android, or a Kindle Reader
I can send a Web link for reading if you have this issue.
Allowing Bruce to Send a Kindle file to your app:
FROM YOUR WEB BROWSER:
Select My Account >>>
Select Manage Content and Devices >>>
Select Preferences >>>
Scroll Down to Personal Document Settings
Locate your Send to Kindle email address
Copy this and DM or email this address to Bruce >>>
Add “firstname.lastname@example.org” as an approved email address >>>