Page resources2 rules onwhether your pages can load their supporting files.

Images and other embedded files, and the site icon.

Embedded files

An embedded image or media file needs attentionA recorded HTML reference points to an image, media file or poster that returned a confirmed error or restricted access to the audit reader.In the report: An embedded image or media file needs attention
The favicon declaration, image or crawler access does not meet the checked requirementsThe homepage declares no icon, every declared icon is confirmed unusable, or a qualified robots.txt reading blocks Googlebot from the homepage.In the report: Favicon is missing, not crawlable, or below Google's display requirements