You can edit images that have been uploaded to the File Manager, such as cropping images, resizing images, and rotating images. Here's how:
Go to the Tools > Asset Manager menu.
If you have not uploaded the image you want to edit, click 'Add Files' at the top right.
Once you have the image, hover over the image you want to edit and click the edit icon as shown below.
Then an image like this will appear:
You can change the orientation, image ratio, and even resize the image.