An Azure service that enables developers and testers to generate insights on how to improve the performance, scalability, and capacity usage of their application
you can check the above document for full explanation and more details
as you can see there are limits with the zip file
the zip file being below 50 MB in size. Azure Load Testing can automatically unzip these files during the test run. The service permits up to five zip artifacts, each with a maximum of 1000 files, and an uncompressed total size of 1 GB