As of 13-11-18, I was sharing APK files on WhatsApp, for testing apps within a circle of people, with no problem whatsoever. But as of today, if I try to open an apk, I get an error toast saying:
You may not have the proper app to view this content.
Did they change their policies and decided not to let people share APK files on their platform?
I don't use third party websites for sharing APKs, where mostly Chrome spooks most people saying that "This type of file may harm your device".