I need an Android specialist to unravel two stubborn technical glitches that only appear on mobile: 1) Instagram shows every conversation except one—yet the same chat is perfectly intact when I open Instagram in a browser. 2) WhatsApp reports that my backup is fine, but some older voice note from that backup is “missing from internal storage.” I’m looking for a clear diagnosis of why each issue occurs and a practical, repeat-able fix I can apply on my device and share with friends if it happens again. A concise report or step-by-step walkthrough is ideal; a brief remote session is fine if needed for verification. Once your solution restores the disappearing chat and surfaces the hidden voice notes, the job is done.