Migrating testlink ID into Testrail

Hi

I just installed Testrail to see if we can migrate our current testlink project.

Migrating data seems to be working so far, with our test suites and test cases.

The only issue is that we can't see in any part of the imported data the testlink ID of the test cases. We looked into the xml file generated from the migration script and we see that there's a "internalid" attribute on the testcase nodes, which is the testlink ID, but it seems that it's not imported into Testrail.

Is there any way we can keep those testlink ID associated to the testcases imported on Testrail?

Thanks in advance