Problems attaching to ACF file field from the "Global Media" Tab

[mikem33]

I have some ACF File fields that if I attach to them PDF's files uploaded in the main site from the "Global Media" tab, in first instance it get attached to them without any apparent problem but when I reload the page after saving it, the file is no longer attached to them.

If the file is from the current site it works without problem. I suppose this is Gutenberg related.
Any idea? Thank you in advance!

[feldmarv]

We are faceing the same isse on our current installation.

WP Version 5.0.3
Multisite Global Media 0.1.0-dev-2
Advanced Custom Fields PRO (ACF) Version 5.8.1

[Leobar00]

Same issue of @mikem33 with gallery ACF

[bueltge]

@feldmarv @mikem33 and @Leobar00 have you tried this with the last version, that have several enhancements for the ACF plugin?

[samykantari]

@bueltge @feldmarv @mikem33
I have the same problem, with :
WP Version 6.0.1
Multisite Global Media 0.2.0
Advanced Custom Fields PRO (ACF) Version 5.12.3

Searching in the ACF source code, I found a solution

In the file (acf) : acf/includes/api/api-helpers.php function acf_get_attachment

At first :

// Allow filter to short-circuit load attachment logic.
// Alternatively, this filter may be used to switch blogs for multisite media functionality.
$response = apply_filters( 'acf/pre_load_attachment', null, $attachment );
if ( $response !== null ) {
	return $response;
}

So we have an interesting hook "acf/pre_load_attachment" and the answer expected by ACF is an array

We can use the hook, if we are in the context "global media" then we can make the "switch" get the info from the media and return it

add_action(
	'acf/init',
	function () {
		add_filter(
			'acf/pre_load_attachment',
			function ( $value, $attachment ) {
				$siteIdPrefix = '100000';

				if ( false !== strpos( (string) $attachment, $siteIdPrefix ) ) {
					$formatted = str_replace( $siteIdPrefix, '', $attachment );
					switch_to_blog( get_main_site_id() );

					$fileNotExist = false;

					$attachment = get_post( $formatted );


					if ( ! $attachment ) {
						$fileNotExist = true;
					}
					if ( 'attachment' !== $attachment->post_type ) {
						$fileNotExist = true;
					}
					$response = false;

					if ( false === $fileNotExist ) {

						$meta          = wp_get_attachment_metadata( $attachment->ID );
						$attached_file = get_attached_file( $attachment->ID );
						if ( strpos( $attachment->post_mime_type, '/' ) !== false ) {
							list( $type, $subtype ) = explode( '/', $attachment->post_mime_type );
						} else {
							list( $type, $subtype ) = array( $attachment->post_mime_type, '' );
						}

						$response = array(
							'ID'          => $attachment->ID,
							'id'          => $attachment->ID,
							'title'       => $attachment->post_title,
							'filename'    => wp_basename( $attached_file ),
							'filesize'    => 0,
							'url'         => wp_get_attachment_url( $attachment->ID ),
							'link'        => get_attachment_link( $attachment->ID ),
							'alt'         => get_post_meta( $attachment->ID, '_wp_attachment_image_alt', true ),
							'author'      => $attachment->post_author,
							'description' => $attachment->post_content,
							'caption'     => $attachment->post_excerpt,
							'name'        => $attachment->post_name,
							'status'      => $attachment->post_status,
							'uploaded_to' => $attachment->post_parent,
							'date'        => $attachment->post_date_gmt,
							'modified'    => $attachment->post_modified_gmt,
							'menu_order'  => $attachment->menu_order,
							'mime_type'   => $attachment->post_mime_type,
							'type'        => $type,
							'subtype'     => $subtype,
							'icon'        => wp_mime_type_icon( $attachment->ID ),
						);

						if ( isset( $meta['filesize'] ) ) {
							$response['filesize'] = $meta['filesize'];
						} elseif ( file_exists( $attached_file ) ) {
							$response['filesize'] = filesize( $attached_file );
						}
					}


					restore_current_blog();

					return $response;
				}


				return $value;
			},
			10,
			2
		);
	}
);

@Leobar00 I don't have a fix for your problem But you can cheat :)
Create a gallery with images from the site (not "global media") and then go to each image and replace the media with a "global media" image
The problem is that if you change the gallery by adding an image you will have to replace everything again. So when creating the gallery, choose the number of images carefully :D