Magento – magento backend can’t upload images when media is on cdn

Try the event catalog_product_gallery_upload_image_after this should be fired on the upload action of the controller Mage_Adminhtml_Catalog_Product_GalleryController from your question I think this is the right event for you.

Most likely its because you are saving the product after every addImagetoMediaGallery moving it out of the loop of both images should suffice.

Untested but like this perhaps?

foreach ($skuImageMap as $sku => $images) {
    $ourProduct = Mage::getModel('catalog/product')->loadByAttribute('sku', $sku);
    $saveFlag = true;
    if ($ourProduct) {
        foreach ($images as $index => $imagePath) {
            if (file_exists($imagePath)) {
                try {
                    $ourProduct->addImageToMediaGallery($imagePath, null, false, false);
                    $imageCount++;
                } catch (Exception $e) {
                    $saveFlag = false;
                    echo "There was an issue saving image $imagePath to $sku :" . $e->getMessage() . "\n";
                }
            } else {
                $saveFlag = false;
                echo "The image $imagePath does not exist.\n";
            }
        }

        if($saveFlag) {
            try {
                $ourProduct->save();
                echo "The image $imagePath was added to $sku successfully : $imageCount \n";
            } catch (Exception $e) {
                zend_debug::dump($e->getMessage());
            }
        }

    } else {
        echo "The product $sku does not exist \n";
    }
}