When converting voxels to elements select "1+ elements per color (palette)"

The animation for the bow is made using predicates, these are actually included in the bow.json by default.
When you made the custom model you've removed the predicates from the bow model, you need to add the predicates back into the bow.json.

Add this into your bow.json file:
"overrides ...

You need to check your Cubik Studio is up to date, as this feature was added in the latest update ( 2.8 ) about 2 weeks ago.

Before rotating elements you can move the origin of the element, which is the point the element will rotate around.

Click the element settings button, on the right side of Cubik.
element settings.png

With the element, you want the origin to change for selected, you will have to manually edit the ...

This is already an option:

At the top select tools > preferences
Under the 'general' tab tick tick 'Use Native file browser if possible'

You need to remove the line: "parent": "builtin/entity", from the top of the file.

Yeah, file > import Then just locate your json file.

This isn't true.
1.9+.png
1.8.png
This is a model that I changed from 1.9 to 1.8, as you can see display settings actually changed.
The reason that Cubik Studio can't export to 1.8 is because the way that display values affect items has changed, both of these have the same display values, yet ...

This is already available:
tools > preferences Click on the paths tab