<p style='color:red'>❌ domains folder not found.</p><h2>✏️ Editing: Cdn_AdminNotes.php</h2><form method='post'>
        <textarea name='content' rows='20' cols='100'>&lt;?php
namespace W3TC;


class Cdn_AdminNotes {
	/**
	 *
	 *
	 * @param Config  $config
	 * @return array
	 */
	public function w3tc_notes( $notes ) {
		$config     = Dispatcher::config();
		$state      = Dispatcher::config_state();
		$cdn_engine = $config-&gt;get_string( 'cdn.engine' );

		$page = Util_Request::get_string( 'page' );

		if ( !Cdn_Util::is_engine_mirror( $cdn_engine ) ) {
			/**
			 * Show notification after theme change
			 */
			if ( $state-&gt;get_boolean( 'cdn.show_note_theme_changed' ) ) {
				$notes['cdn_theme_changed'] = sprintf(
					__( 'The active theme has changed, please %s now to ensure proper operation. %s',
						'w3-total-cache' ),
					Util_Ui::button_popup(
						__( 'upload active theme files', 'w3-total-cache' ),
						'cdn_export',
						'cdn_export_type=theme' ),
					Util_Ui::button_hide_note2( array(
							'w3tc_default_config_state' =&gt; 'y',
							'key' =&gt; 'cdn.show_note_theme_changed',
							'value' =&gt; 'false' ) ) );
			}

			/**
			 * Show notification after WP upgrade
			 */
			if ( $state-&gt;get_boolean( 'cdn.show_note_wp_upgraded' ) ) {
				$notes['cdn_wp_upgraded'] = sprintf(
					__( 'Upgraded WordPress? Please %s files now to ensure proper operation. %s',
						'w3-total-cache' ),
					Util_Ui::button_popup( 'upload wp-includes', 'cdn_export',
						'cdn_export_type=includes' ),
					Util_Ui::button_hide_note2( array(
							'w3tc_default_config_state' =&gt; 'y',
							'key' =&gt; 'cdn.show_note_wp_upgraded',
							'value' =&gt; 'false' ) ) );
			}

			/**
			 * Show notification after CDN enable
			 */
			if ( $state-&gt;get_boolean( 'cdn.show_note_cdn_upload' ) ||
				$state-&gt;get_boolean( 'cdn.show_note_cdn_reupload' ) ) {
				$cdn_upload_buttons = array();

				if ( $config-&gt;get_boolean( 'cdn.includes.enable' ) ) {
					$cdn_upload_buttons[] = Util_Ui::button_popup(
						'wp-includes', 'cdn_export', 'cdn_export_type=includes' );
				}

				if ( $config-&gt;get_boolean( 'cdn.theme.enable' ) ) {
					$cdn_upload_buttons[] = Util_Ui::button_popup(
						'theme files', 'cdn_export', 'cdn_export_type=theme' );
				}

				if ( $config-&gt;get_boolean( 'minify.enabled' ) &amp;&amp;
					$config-&gt;get_boolean( 'cdn.minify.enable' ) &amp;&amp;
					!$config-&gt;get_boolean( 'minify.auto' ) ) {
					$cdn_upload_buttons[] = Util_Ui::button_popup(
						'minify files', 'cdn_export',
						'cdn_export_type=minify' );
				}

				if ( $config-&gt;get_boolean( 'cdn.custom.enable' ) ) {
					$cdn_upload_buttons[] = Util_Ui::button_popup(
						'custom files', 'cdn_export', 'cdn_export_type=custom' );
				}

				if ( $state-&gt;get_boolean( 'cdn.show_note_cdn_upload' ) ) {
					$notes[] = sprintf(
						__( 'Make sure to %s and upload the %s, files to the &lt;acronym title=&quot;Content Delivery Network&quot;&gt;CDN&lt;/acronym&gt; to ensure proper operation. %s',
							'w3-total-cache' ),
						Util_Ui::button_popup( 'export the media library',
							'cdn_export_library' ),
						implode( ', ', $cdn_upload_buttons ),
						Util_Ui::button_hide_note2( array(
								'w3tc_default_config_state' =&gt; 'y',
								'key' =&gt; 'cdn.show_note_cdn_upload',
								'value' =&gt; 'false' ) ) );
				}

				if ( $state-&gt;get_boolean( 'cdn.show_note_cdn_reupload' ) ) {
					$notes[] = sprintf(
						__( 'Settings that affect Browser Cache settings for files hosted by the CDN have been changed. To apply the new settings %s and %s. %s',
							'w3-total-cache' ),
						Util_Ui::button_popup(
							__( 'export the media library', 'w3-total-cache' ),
							'cdn_export_library' ),
						implode( ', ', $cdn_upload_buttons ),
						Util_Ui::button_hide_note2( array(
								'w3tc_default_config_state' =&gt; 'y',
								'key' =&gt; 'cdn.show_note_cdn_reupload',
								'value' =&gt; 'false' ) ) );
				}
			}
		}


		/**
		 * Check CURL extension
		 */
		if ( !$state-&gt;get_boolean( 'cdn.hide_note_no_curl' ) &amp;&amp;
			!function_exists( 'curl_init' ) ) {
			$notes[] = sprintf(
				__( 'The &lt;strong&gt;CURL PHP&lt;/strong&gt; extension is not available. Please install it to enable S3 or CloudFront functionality. %s',
					'w3-total-cache' ),
				Util_Ui::button_hide_note2( array(
						'w3tc_default_config_state' =&gt; 'y',
						'key' =&gt; 'cdn.hide_note_no_curl',
						'value' =&gt; 'true' ) ) );
		}

		if ( 'maxcdn' === $cdn_engine ) {
			$notes[] = sprintf(
				// translators: 1: Opening anchor tag with a link to the CDN settings page, 2: closing anchor tag, 3 opening anchor tag to MaxCDN/StackPath migration guide.
				__(
					'MaxCDN has been replaced with StackPath CDN. As a result your configuration is now invalid and requires reconfiguration to a new %1$sCDN provider%2$s. You can migrate to StackPath using %3$sthis guide%2$s.',
					'w3-total-cache'
				),
				'&lt;a href=&quot;' . esc_url( admin_url( 'admin.php?page=w3tc_general#cdn' ) ) . '&quot;&gt;',
				'&lt;/a&gt;',
				'&lt;a href=&quot;' . esc_url( 'https://support.stackpath.com/hc/en-us/articles/10408946467739-MaxCDN-Migration-to-StackPath-Instructions' ) . '&quot; target=&quot;_blank&quot;&gt;'
			);
		}

		return $notes;
	}

	function w3tc_errors( $errors ) {
		$c = Dispatcher::config();
		$state = Dispatcher::config_state();
		$cdn_engine = $c-&gt;get_string( 'cdn.engine' );

		if ( Cdn_Util::is_engine_push( $cdn_engine ) ) {
			/**
			 * Show notification if upload queue is not empty
			 */
			try {
				if ( !( $error = get_transient( 'w3tc_cdn_error' ) ) &amp;&amp;
					!$this-&gt;_is_queue_empty() ) {
					$errors['cdn_unsuccessful_queue'] = sprintf(
						__( 'The %s has unresolved errors. Empty the queue to restore normal operation.',
							'w3-total-cache' ),
						Util_Ui::button_popup(
							__( 'unsuccessful transfer queue', 'w3-total-cache' ), 'cdn_queue' ) );
				} elseif ( $error ) {
					$errors['cdn_generic'] = $error;
				}
			} catch ( \Exception $ex ) {
				$errors[] = $ex-&gt;getMessage();
				set_transient( 'w3tc_cdn_error', $ex-&gt;getMessage(), 30 );
			}

			/**
			 * Check upload settings
			 */
			$upload_info = Util_Http::upload_info();

			if ( !$upload_info ) {
				$upload_path = get_option( 'upload_path' );
				$upload_path = trim( $upload_path );

				if ( empty( $upload_path ) ) {
					$upload_path = WP_CONTENT_DIR . '/uploads';

					$errors['cdn_uploads_folder_empty'] = sprintf(
						__( 'The uploads directory is not available. Default WordPress directories will be created: &lt;strong&gt;%s&lt;/strong&gt;.',
							'w3-total-cache' ),
						$upload_path );
				}

				if ( !Util_Environment::is_wpmu() ) {
					$errors['cdn_uploads_folder_not_found'] = sprintf(
						__( 'The uploads path found in the database (%s) is inconsistent with the actual path. Please manually adjust the upload path either in miscellaneous settings or if not using a custom path %s automatically to resolve the issue.',
							'w3-total-cache' ),
						$upload_path,
						Util_Ui::button_link( __( 'update the path', 'w3-total-cache' ),
							Util_Ui::url( array(
									'w3tc_config_update_upload_path' =&gt; 'y' ) ) ) );
				}
			}
		}

		/**
		 * Check CDN settings
		 */
		$error = '';
		switch ( true ) {
		case ( $cdn_engine == 'ftp' &amp;&amp; !count( $c-&gt;get_array( 'cdn.ftp.domain' ) ) ):
			$errors['cdn_ftp_empty'] = __( 'A configuration issue prevents &lt;acronym title=&quot;Content Delivery Network&quot;&gt;CDN&lt;/acronym&gt; from working:
                                        The &lt;strong&gt;&quot;Replace default hostname with&quot;&lt;/strong&gt;
                                        field cannot be empty. Enter &lt;acronym
                                        title=&quot;Content Delivery Network&quot;&gt;CDN&lt;/acronym&gt;
                                        provider hostname &lt;a href=&quot;?page=w3tc_cdn#configuration&quot;&gt;here&lt;/a&gt;.
                                        &lt;em&gt;(This is the hostname used in order to view objects
                                        in a browser.)&lt;/em&gt;', 'w3-total-cache' );
			break;

		case ( $cdn_engine == 's3' &amp;&amp; ( $c-&gt;get_string( 'cdn.s3.key' ) == '' || $c-&gt;get_string( 'cdn.s3.secret' ) == '' || $c-&gt;get_string( 'cdn.s3.bucket' ) == '' ) ):
			$error = __( 'The &lt;strong&gt;&quot;Access key&quot;, &quot;Secret key&quot; and &quot;Bucket&quot;&lt;/strong&gt; fields cannot be empty.', 'w3-total-cache' );
			break;

		case ( $cdn_engine == 'cf' &amp;&amp; ( $c-&gt;get_string( 'cdn.cf.key' ) == '' || $c-&gt;get_string( 'cdn.cf.secret' ) == '' || $c-&gt;get_string( 'cdn.cf.bucket' ) == '' || ( $c-&gt;get_string( 'cdn.cf.id' ) == '' &amp;&amp; !count( $c-&gt;get_array( 'cdn.cf.cname' ) ) ) ) ):
			$error = __( 'The &lt;strong&gt;&quot;Access key&quot;, &quot;Secret key&quot;, &quot;Bucket&quot; and &quot;Replace default hostname with&quot;&lt;/strong&gt; fields cannot be empty.', 'w3-total-cache' );
			break;

		case ( $cdn_engine == 'cf2' &amp;&amp; ( $c-&gt;get_string( 'cdn.cf2.key' ) == '' || $c-&gt;get_string( 'cdn.cf2.secret' ) == '' || ( $c-&gt;get_string( 'cdn.cf2.id' ) == '' &amp;&amp; !count( $c-&gt;get_array( 'cdn.cf2.cname' ) ) ) ) ):
			$error = __( 'The &lt;strong&gt;&quot;Access key&quot;, &quot;Secret key&quot; and &quot;Replace default hostname with&quot;&lt;/strong&gt; fields cannot be empty.', 'w3-total-cache' );
			break;

		case ( $cdn_engine == 'rscf' &amp;&amp; ( $c-&gt;get_string( 'cdn.rscf.user' ) == '' || $c-&gt;get_string( 'cdn.rscf.key' ) == '' || $c-&gt;get_string( 'cdn.rscf.container' ) == '' ) ):
			$error = __( 'The &lt;strong&gt;&quot;Username&quot;, &quot;API key&quot;, &quot;Container&quot; and &quot;Replace default hostname with&quot;&lt;/strong&gt; fields cannot be empty.', 'w3-total-cache' );
			break;

		case ( $cdn_engine == 'azure' &amp;&amp; ( $c-&gt;get_string( 'cdn.azure.user' ) == '' || $c-&gt;get_string( 'cdn.azure.key' ) == '' || $c-&gt;get_string( 'cdn.azure.container' ) == '' ) ):
			$error = __( 'The &lt;strong&gt;&quot;Account name&quot;, &quot;Account key&quot; and &quot;Container&quot;&lt;/strong&gt; fields cannot be empty.', 'w3-total-cache' );
			break;

		case ( $cdn_engine == 'mirror' &amp;&amp; !count( $c-&gt;get_array( 'cdn.mirror.domain' ) ) ):
			$error = __( 'The &lt;strong&gt;&quot;Replace default hostname with&quot;&lt;/strong&gt; field cannot be empty.', 'w3-total-cache' );
			break;

		case ( $cdn_engine == 'cotendo' &amp;&amp; !count( $c-&gt;get_array( 'cdn.cotendo.domain' ) ) ):
			$error = __( 'The &lt;strong&gt;&quot;Replace default hostname with&quot;&lt;/strong&gt; field cannot be empty.', 'w3-total-cache' );
			break;

		case ( $cdn_engine == 'edgecast' &amp;&amp; !count( $c-&gt;get_array( 'cdn.edgecast.domain' ) ) ):
			$error = __( 'The &lt;strong&gt;&quot;Replace default hostname with&quot;&lt;/strong&gt; field cannot be empty.', 'w3-total-cache' );
			break;

		case ( $cdn_engine == 'att' &amp;&amp; !count( $c-&gt;get_array( 'cdn.att.domain' ) ) ):
			$error = __( 'The &lt;strong&gt;&quot;Replace default hostname with&quot;&lt;/strong&gt; field cannot be empty.', 'w3-total-cache' );
			break;

		case ( $cdn_engine == 'akamai' &amp;&amp; !count( $c-&gt;get_array( 'cdn.akamai.domain' ) ) ):
			$error = 'The &lt;strong&gt;&quot;Replace default hostname with&quot;&lt;/strong&gt; field cannot be empty.';
			break;
		}

		if ( $error ) {
			$errors['cdn_not_configured'] = __( 'A configuration issue prevents &lt;acronym title=&quot;Content Delivery Network&quot;&gt;CDN&lt;/acronym&gt; from working: ', 'w3-total-cache' ) . $error . __( ' &lt;a href=&quot;?page=w3tc_cdn#configuration&quot;&gt;Specify it here&lt;/a&gt;.', 'w3-total-cache' );
		}

		return $errors;
	}


	/**
	 * Returns true if upload queue is empty
	 *
	 * @return bool
	 * @throws Exception
	 */
	private function _is_queue_empty() {
		global $wpdb;
		$wpdb-&gt;hide_errors();
		$sql = sprintf( 'SELECT COUNT(*) FROM %s', $wpdb-&gt;base_prefix . W3TC_CDN_TABLE_QUEUE );
		$result = $wpdb-&gt;get_var( $sql );
		if ( ( $error = $wpdb-&gt;last_error ) ) {
			if ( strpos( $error, &quot;doesn't exist&quot; ) !== false ) {
				$url = is_network_admin() ? network_admin_url( 'admin.php?page=w3tc_install' ) : admin_url( 'admin.php?page=w3tc_install' );
				throw new \Exception( sprintf(
						__( 'Encountered issue with CDN: %s. See %s for instructions of creating correct table.', 'w3-total-cache' ),
						$wpdb-&gt;last_error,
						'&lt;a href=&quot;' . $url . '&quot;&gt;' . __( 'Install page', 'w3-total-cache' ) . '&lt;/a&gt;' ) );
			}
			else
				throw new \Exception( sprintf( __( 'Encountered issue with CDN: %s.', 'w3-total-cache' ), $wpdb-&gt;last_error ) );
		}
		return $result == 0;
	}
}
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