I used external WMS layer (EPSG: 3112) as a base map for my local WMS layers. WMS owner stopped to provide WMS and has WMTS getcapabilities link instead. I never worked with WMTS before.
I have added it as a WMTS store and published layer. It's projection is 3857 (recognized by GeoServer). I can view it in Layer Preview section successfully.
The thing is that I need to visualize it with my own other WMS layers, which are in EPSG:28356. And it is not visible probably due to another projection. I don't understand how to change it. I tried to assign 3112 and 28356 and played with Bounding Box coordinates, but none of the options work.
Here is settings of the new WMTS layer:
This is settings for old WMS, which is not provided anymore:
In GeoServer documentation I saw that it should be able to reproject dynamically:
Connecting a remote WMTS allows for the following features: Dynamic reprojection. While the default projection for a layer is cascaded, it is possible to pass the SRS parameter through to the remote WMS. Should that SRS not be valid on the remote server, GeoServer will dynamically reproject the tiles sent to it from the remote WMTS.
But I don't understand how to use that properly.