D2L - Determining if Student Uploaded a File to ePortfolio
If you're an instructor who requires students to upload a file to their ePortfolios, the best way to determine whether they have done so is to create a Dropbox and require them to submit their uploads to it from their ePortfolios.
This article describes how instructors can find out if a student uploaded a file to their D2L ePortfolio.
Once they have done so, you can tell that the items in the Dropbox came from ePortfolio by looking at the file extensions. If the file extension is .d2lresource, it came from ePortfolio.