I am working on an API app based on a VectorExpress vector converter. Here is the demo - https://vector.express/

The problem is that I am not able to make all vector file conversions work. Only 17x check this screenshot.

I got some info that only 'in' formats can be converted into 'out' formats based on this API documentation - https://github.com/smidyo/vectorexpress-api

My backend code looks like this - https://vectorization.eu/tools/css/image-controller.js

Do you have some suggestions on how to make file conversions like (e.g. PDF to DWG, or AI to SVG) work?

I would be grateful for your advice.