BEFORE
AFTER
Pick one file for each side. You can also drop both files anywhere in this box.
Structure the zip with two top-level folders. Files are paired by matching relative path/name.
comparison.zip
├── before/
│ ├── meeting_standup.pdf
│ └── meeting_retro.pdf
└── after/
├── meeting_standup.pdf
└── meeting_retro.pdf
Files only present on one side are still shown, flagged as added/removed.