I tried searching this forum, but got a lot of errors and couldn't read a lot of the results.
The actual uploading of images with the Image Advanced field seems to work fine. The Media Library modal opens, images can be uploaded and selected. However, afterwards, if the Media Library modal is opened again or opened at a different time, the images that were uploaded with the Image Advanced field do not appear. I can't seem to figure out why. Images uploaded with a Single Image field appear just fine in the Media Library modal.
Here are the settings for the field (the rest of the fields in the meta box work fine):
array (
'id' => 'photos',
'type' => 'image_advanced',
'name' => 'Photos',
'desc' => 'You may upload up to 12 photos.',
'force_delete' => 1,
'max_file_uploads' => 12,
'image_size' => 'thumbnail',
'max_status' => 1,
),