Items to Migrate 
1. From File explorer you can either drag and drop files to SharePoint explorer or simply select files from file explorer Right Click and Select Add to SharePoint to add files to Items to migrate.
The Items to migrate appears as shown below:


2. The selected folders and files added for import will be displayed in the Items to Migrate page. Dockit 365 Migrator processes the top-level folders and files added for import in the order in which it appears in the Items to Migrate page. The import process order can be changed by the navigation buttons available in the right side of the page. You can remove the files and folders added for import by clicking Red X beside the files.

3. Click > button to proceed.