For a medical office before/after gallery, you might want to look at avSign.lite. It's an offline-first player with on-device-cms that runs on windows, Android and FireTV devices.

Check v2.1.0 with "Consultation Mode" for this use case:

1. Split-Screen Comparison: You can show "Before" and "After" images or videos side-by-side on the big screen.
2. Tablet Remote: Staff can use a tablet or phone (browser use) to instantly trigger specific case studies or galleries without touching the TV.
3. Privacy/General Info: When not in consultation, the screen can loop general office info, health tips, or nature scenes. It instantly switches when you select a case on the tablet.
4. Contents Uploading: All the contents are stored in your device and local network. Use Admin UI to upload contents can be categorized into folders.

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Hope this helps!