If a submission does not appear in the Canvas SpeedGrader but is available within the LTI assignment inbox, it may indicate that the student has submitted directly through the Turnitin website rather than through Canvas. Please double-check how the submission was made with your student.
Submissions made directly to the Turnitin website will not be passed onto SpeedGrader. Therefore, students will need to submit again through Canvas to have the submission shown in SpeedGrader.