As @anthonymaverick pointed out, we currently do not have support for importing PDF files natively into the DataRobot Platform.
That being said, could you please describe the use case/problem you are trying to solve using Text data?
If you would like to quickly explore Text-related insights that the DataRobot Platform Trial offers, you can use one of the example common use case projects called "Hospital Readmission" available from the Create New Project page (see screenshot below).
This example dataset contains three Text features:
Within the example project, you can inspect the Word Cloud insights either by clicking on the Text features from the Data page or by navigating to the Models -> Insights -> Word Cloud page (see screenshot below).
For more information on the Word Cloud insight, take a look at the Platform documentation tutorial guide: