Short answer
AskTuring automatically detects duplicate files and prevents the duplicate upload.
Full explanation
When you upload a file, AskTuring scans its contents to check if it already exists in the Index. This detection works even if the file has a different name.
If the system finds a match, the upload is stopped and you will see a notification that the file is a duplicate. This helps keep your Index clean, avoids unnecessary storage use, and ensures the AI is working with the right set of documents.