Re: Samsung Galaxy mini and Tab 3.8
Welcome to Android Central! What are you using to look for the downloads? If you're using the Downloads app, make sure the options are set to view all downloaded files, and not to hide ones that are more than 2-3 days old (which is a feature on some phones).
If you still can't find them, use a file manager app like ES File Explorer to look in the Downloads folder.
Also, what app are you using to download? Some apps or 3rd party browsers will download to their own folder, not the main Downloads folder.