WhatsApp Blue Tick Toggle Guide

I want a concise, device-specific walkthrough that shows me exactly how to enable and disable WhatsApp’s blue ticks (read receipts) on both iOS and Android. The guide should:

• Explain where the setting sits in the latest public version of WhatsApp, with screenshots or annotated images for clarity.
• Note any limitations—for example, how disabling read receipts affects voice notes and group chats.
• Include a quick-reference summary I can share with non-technical colleagues.

Please deliver the material in a well-formatted PDF plus the original editable source (Word, Google Docs, or similar).