You can sign into Google Drive using the same username and password as Gmail, YouTube, and all other Google apps.

But if you use Google Drive, all your photos, videos and other random documents might be eating up the 15GB of free storage Google Drive provides. If you run out of storage, you'll see a message ...

You can view your files in Gmail without downloading them to your device. Some file types, like images, are easy to preview in Gmail. Other files, like videos ...