This video explains how to upload files to SharePoint Online using CDI.

For further information, refer the following:
• https://knowledge.informatica.com/s/article/000243981?language=en_US
• https://docs.informatica.com/integration-cloud/data-integration-connectors/current-version/microsoft-sharepoint-online-connector/mappings-and-mapping-tasks-with-microsoft-sharepoint-online-conn/microsoft-sharepoint-online-targets-in-mappings.html