Remote control: iOS-attached photos silently dropped (empty message, no image block) on desktop session

Summary

When attaching a photo in the Claude iOS app and sending it to a remote-controlled Claude Code session (VS Code extension), the image is silently dropped. The desktop session receives a user message with no image content block — effectively an empty message. Attaching/sending appears to succeed on the phone; the image just never reaches the session.

Environment

• Desktop: Claude Code VS Code extension v2.1.177 (macOS, Apple Silicon)
• Mobile: Claude iOS app, updated ~2026-06-16 10:30 UTC
• Mode: Remote control (controlling the VS Code session from the iOS app)

Evidence (from session transcripts ~/.claude/projects/.../*.jsonl)

• Before ~10:27 UTC on 2026-06-16: 25 phone-attached images were delivered correctly as image/jpeg blocks (promptSource: sdk) on desktop extension v2.1.177.
• After ~10:33 UTC: same channel (promptSource: sdk), same desktop version (2.1.177, unchanged), but images now arrive with zero image content blocks — empty user messages.
• Across the last 12 sessions the desktop transcript version field is uniformly 2.1.177 (no desktop version change). The only variable that changed around 10:30 UTC was the iOS app update.

Expected

The attached photo should arrive as an image content block in the session, as it did before the iOS app update.

Actual

The session receives an empty user message; the image content block is absent. Sending photos from phone to a remote desktop session — a previously working flow — is now broken.