Sherrie,
If you can't find them in the actual class by going to the Assignment, submitted files can usually also be located in your own Files area. I'm not sure about doing this on the Canvas App, but in the web UI click on Account and select Files. Open the My Files folder and then the Submissions folder. There should now be folders for any classes you've submitted assignment files to in the past. Open the folder and find your file (hopefully).
Rick
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