Prerequisites
You should pass variables in the API request, since we use the variables to define columns of the dataset. Learn how to log variables here.Steps
1
Choose the logs you want to include in the testset
Click a log, and if it has the Variables section, it means the log has variables and can be included in the testset.

2
Bring the log to the testset
Click the 
+
button, and choose the testset you want to add the log to or create a new testset.