Stream Amazon Prime Video from Android to Chromecast

Amazon Prime Video on Chromecast - only possible via detours

Some time ago, the free Android app Primecast made it possible to stream films and series from Amazon Prime Video. The app stopped working after 36 hours because Amazon changed the source code of its streaming service.
The app was quickly removed from the Google Play Store. Only via the Airplay app on the iPhone or iPad is it possible to stream Amazon video via Chromecast to an Apple TV.
So it is now only possible via a detour to watch movies from Amazon Prime on the Chromecast under Android or with a PC.

You can stream Amazon video via smartphone.

To do this, open the "Google Home" app on your smartphone, where you have also installed Amazon Prime Video.
In Google Home, click on the three horizontal lines in the top left and then press "Screen / Stream audio". Now select the device on which you want to watch the film. Now your entire smartphone display will be streamed to the Chromecast.
Now open the Amazon Prime Video app on your smartphone and start the desired film. If the image quality leaves something to be desired, place the smartphone closer to the WLAN router.
Conclusion: As long as Amazon's Android app does not support the Chromecast, you are dependent on other devices such as the Amazon Fire TV to stream films and series on the TV. Or you can take the detour via a mirrored screen.

If you want to use the browser, proceed as follows:

Then open Amazon Prime Video in the Chrome browser.
Click the 3 dots menu in the top right of the browser. And click "Stream". Now you are looking for suitable devices, select your Google Chromecast here. Then the opened tab should be transferred in the browser.