The S3 documentation states that you can use drag and drop individual files or folders using the console.
"When you upload a folder, Amazon S3 uploads all of the files and subfolders from the specified folder to your bucket. It then assigns an object key name that is a combination of the uploaded file name and the folder name. For example, if you upload a folder named /images that contains two files, sample1.jpg and sample2.jpg, Amazon S3 uploads the files and then assigns the corresponding key names, images/sample1.jpg and images/sample2.jpg. The key names include the folder name as a prefix. The Amazon S3 console displays only the part of the key name that follows the last /. For example, within an images folder the images/sample1.jpg and images/sample2.jpg objects are displayed as sample1.jpg and a sample2.jpg."
The latest documentation is available here: https://docs.aws.amazon.com/AmazonS3/latest/userguide/upload-objects.html
Furthermore you can use 3rd party file browsers like Cyberduck or S3 Browser that allow multipart uploads and concurrent upload connections that will greatly speed up the upload process.
