I have a similar problem - imagine this …
A background layer of a landscape.
A middle layer with a rendered 3D model of a building.
A 'foreground' layer for any elements to bring 'forward' of the building - for example, a tree which would actually be in front of the building.
How would I use the clone tool to clone the tree from the background to the foreground layer - while keeping the building layer visible so I can control the results.
The options of 'Current Layer & Below' or 'Layers Beneath' won't work as they would also clone the middle layer.
Photoshop can clone from a specific layer to another - any way to do this in Affinity Photo?