Soholaunch Ultra comes with the ability to perform some basic edting tasks on images. To access this feature, go to the File Manager and click "Edit".
The slider to the top left of the image will adjust the size of the image. You can see the image size in pixels, just above the picture. The slider to the top right of the image will rotate the image in 90 degree increments, clockwise. Also, by clicking and dragging the lower right corner of the image, you can crop the picture.
Once you are happy with your edits, just click save. If you don't want to overwrite the original image, enter a new name before clicking the save button.