Import wizard | Add Folder option is used to import multiple files in a folder into an Oracle table. Import does not commit data until all files processed.
WORKAROUND:
Import files individually.
STATUS:
This feature is not available in the current version of Toad for Oracle. To log an enhancement request for this feature, please visit the Toad Idea Pond. This site is solely dedicated to tracking customer enhancement requests and allowing the user community to vote on the most useful feature. The development team personally monitors this website and provides customer feedback on their enhancement requests.