Artifact loaded but not shown in the UI



I use free account, and I making a pipeline of Python and execution unit test. The unit test report is generated and after want to load the unit test generated as artifact.

I added this to gitlab-ci.yml:
junit: /builds/myuser/firstdemoproject/python_app/reports/unitTestReport.xml

In CI log I have a message for uploading that everything is correct, with following message:
Uploading artifacts…
/builds/myuser/firstdemoproject/python_app/reports/unitTestReport.xml: found 1 matching files
Uploading artifacts to coordinator… ok id=133947588 responseStatus=201 Created token=3siBpCeC

But there is nothing into the UI to download.

Anybody has any clue about whats happends?

Thanks in advanced