How to use the new Media Manager/Upload image
From Joomla! Documentation
How to Access
To upload a new image, click on the Upload button on the top left side of the page. Select the Folder to load the image into. if no folder is selected, the image will be uploaded to the root images directory.
Once the image is selected from your 'browse' folder, the image is automatically added to the folder of your choice.
- Go to options to change upload sizes and image requirements
- If an image already exists in the folder with the same name, it cannot be re-uploaded. Delete the image first, or re-name the image prior to uploading.