Unacceptably Buggy - Cloud Sync Not Functional - Amazon Offering Newer Version Outside App Store

Spent over an hour with Amazon support trying to get this app to sync bookmarks and highlights to/from the Kindle cloud. Discovered that the latest version in the App Store is 1.12.4, while the latest version available directly from Amazon is 1.15. Not acceptable for Amazon to leave a buggy version in the app store (last updated six months ago) while it (presumably?) fixes these bugs in newer versions which are only available from Amazon.com.

PAUL SIMPSON about Kindle Classic