TestEngine external JAR files - error - unable to resolve class

Background - We have test engine hosted on some linux server and we execute tests suing CURL cmd or POSTMAN.

Given some external JARs

When we add external JARs in /bin/ext folder of test engine server and re-start the test engine

And run the tests using curl command from locally or using POSTMAN

Then it throws error for groovy script test step saying unable to resolve class <className present in external JARs> on import statement itself.

We have also configured .vmoptions of test engine server to read ext JARs but still it throws error.

Locally, In ReadyAPI, we are placing those JARs in /bin/ext/ folder and it works perfectly fine.

Any solution to this problem?