To see all of your files that you've shared, first head over to your 'Videos & Files' page.
Then, click the 'My Files' filter.
Then, switch your view of your Videos & Files page to one of the more condensed views all the way to the right. You will then see more data about your artifacts, like the number of 'Shares' it has. If you hover over the number of shares, you will see who the artifact was shared with.