Hi, @gfenner1 
Welcome to the Canvas Community! Do you mean an assignment where all students will be able to see all other students' submissions? If so, you'd want to use a graded discussion: How do I create a discussion as an instructor? If you want students to reply to an assignment prompt where each submission would only be visible to you, you can use any of the online assignment types, depending on what you expect your students to upload as their "reply": How do I create an online assignment?
Hope this helps.
