Amazfit Watch faces

I have the AMAZFIT GTR 2e and would like to install some more watch faces than is available on the Zepp app,
There is an app on Google Play Store called "Watch Faces & Amazfit" that claims to work with ALL AMAZFIT watches from the BIP to the GTR 2. It says all you do is pick the watch face and tap install. It supposes to work with Zepp and MiFit. Well, it does not work. All I see is for the BIP which I do have and I am able to install with one click.

I would like to use the AW app to install and sync watch faces to my GTR 2e.
Can someone give me a step by step guide so I can do this?

I am using an iPhone. I am not familiar with an Android. But this might give you some idea:

1) Install two different iOS apps called AmazFaces and also AmazTools.
2) Open AmazTools and connect your watch to the phone. For GTR-2e, select "GTR2".
3) Open AmazFaces. Go to the Filter and select to display only watch faces matching your device. For GTR-2e, select "GTR2".
4) Browse and select a watch face you want to install.
5) Press the SHARE icon and send the downloaded file to AmazTools. Press the INSTALL button and start syncing.