Is it possible to delete a file from the Turnitin database?

If the file has already been uploaded on the database, it is very difficult to remove it (only in exceptional cases, you can ask this by contacting eLab).
However, you can exclude the older versions of the same file from the similarity report.

See FAQ: How can I exclude a source from the Turnitin originality report?

(last update: 24.07.2018)