Up to 5 files can be submitted to each Turnitin dropbox. 
In order to submit a file, please follow thgese instructions:
1. Click on the Turnitin dropbox
2. Your name will show up at the bottom of the window
3. Follow the row where your name is at and click on the "Cloud" icon to upload your file
4. Click on the "Refresh" (round arrow) icon about 10-15 minutes after submission in order to see the plagiarism score