Is there a reason why when I upload a file, and in the edit screen when I change data and click Submit it deletes that row? This only happens when a file has been uploaded. Also, is it possible to delete a file and upload another in the edit screen? Sorry for so much. Thanks.
If the entire row is deleted from the edit screen, it sounds like you have a Delete action tied to your on-submit action.
Just add a file picker on the Edit screen. You can remove the old file and upload a new one.