Upload Replacement Image
If you replace an image in the Paligo media library by uploading a new image, every topic using that image will be updated.
To upload a replacement image to the media library:
Select Upload Image (in the lower right corner) to replace the current image with a new one.
Select Select file to add the replacement image.

Select Upload.
Close the dialog when the upload is complete.
Every topic that used the previous image will now use the new one instead.

