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What the check looks at

• Whether the document is tagged, so a screen reader can follow its structure
• The declared language, the document title, and whether viewers display that title
• Alternative text on every figure element in the structure tree
• Encryption, which can block text extraction for assistive technology

It reads the file on your device and produces a report. It does not re-tag or “fix” the document, because automated re-tagging cannot know what the content means.