Validate that file is suitable for displaying within a web page.

Validate that file is an image.

Adds avatars to relevant places in admin.

Builds the Gallery shortcode output.

Retrieves the adjacent post.

Retrieves the attachment fields to edit form fields.

Retrieve HTML content of icon attachment image element.

Retrieve icon URL and Path.

Retrieve HTML content of image element.

Retrieves taxonomies attached to given the attachment.