In case your instructor is using Turnitin on any of your assignments, here’s a link to online documentation about Turnitin: Submitting to an assignment in Canvas Plagiarism Framework – Turnitin Guides

From the above link:

1. From within Canvas, navigate to your assignment and select the assignment name.
2. Depending on the view your institution is using, there are two different views you might see.
   1. If your view looks like the screenshot below:
      
      
      1. Select the Start Assignment button to upload your assignment
      2. Select the Choose File button to upload a file, or select the Text Entry tab for a text-only submission. Be sure to check the box to agree to the End-User License Agreement. Then choose the Submit Assignment button.
         
      3. If resubmissions are allowed for the assignment and you need to resubmit your paper, you can select the New Attempt button at the top right. If you resubmit an edited paper, it will not compare to the first submission you made (i.e. you will not match the text to the previous submission resulting in a 90% match score). 
         
   2. If your view looks like the screenshot below:
      1. Choose your submission type by selecting the Text button for text-only uploads, or the Upload button for a file upload. Be sure to check the box to agree to the End-User License Agreement. Then choose Submit Assignment. 
      2. If resubmissions are allowed for the assignment and you need to resubmit your paper, you can select the New Attempt button at the bottom right. If you resubmit an edited paper, it will not compare to the first submission you made (i.e. you will not match the text to the previous submission resulting in a 90% match score).
         

See our Viewing your Similarity Report in Canvas Plagiarism Framework guidance for more information.