herolulu There are several ways to do this. If you don't mind reducing the size of the images themselves, you can re-import them at a smaller scale.
Otherwise, you can rescale one attachment first, copy its transform by Ctrl+C, select all the other attachments, and paste them with Ctrl+V to align the transform values. This process is demonstrated in the following video:
However, this also aligns all translation and rotation values, so if they are different for each attachment, it may not work.
