How to dynamically specify file path in Karate multipart file?

I need to upload a file to a specific endpoint, but I have a couple of different files for each different environment I'm testing the endpoint in. I have a file structure similar to this:

src
|
+-- java
|  |
|  +-- test.feature
|
+-- resources
|  |
|  +-- dev
|  |  |
|  |  +-- file.txt
|  |
|  +-- qa
|     |
+     +-- file.txt  

So I thought to assign the environment to a variable and use it to indicate the file path in the multipart-file step:

And multipart file file = { read: "classpath:#(environment)/file.txt", filename: 'file.txt', contentType: 'multipart/form-data' }

However, when I tried this, Karate didn't seem to actually replace #(environment) with the proper variable, as I expected it to:

org.graalvm.polyglot.PolyglotException: not found: #(environment)/file.txt

I also tried to use the Karate replace functionality, but that failed for me as well.

Is there any other way to specify a file path like this in Karate?