There is a basic image editor built into Auctria you can use to manipulate images.
On the IMAGES tab of the item, or Donor, details page click the Edit icon (green pencil icon) to open an image in the image editor.
The editor will open as an overlay on the screen.
The most common operations would be to resize, crop, or transform (rotate) the image.
After selecting an operation, click on the green Apply button to set the changes in the editor, then click the Save option (on the far-left) to save the changes back to the server.
This will close the overlay and return to the IMAGES tab.