Refactored the PDF processing workflow to enhance error handling
and provide more descriptive exception messages. Added `try-catch`
blocks around the PDF/A-3b conversion and document saving steps
to handle potential failures.
Labeled the workflow steps for clarity:
- Step 1: Convert to PDF/A-3b
- Step 2: Buffer converted PDF
- Step 3: Embed attachment
- Step 4: Save document
Removed redundant `MemoryStream` initialization for the original
PDF and updated comments to improve code readability and
maintainability.
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