[BUG] iOS app silently drops image attachments (message sends text-only, no error)

Description

Images attached to a message in the Claude Code iOS app are intermittently not delivered. The message sends as text-only, with no error, warning, or retry prompt shown in the app — the attachment is silently dropped on the send/upload path.

Steps to reproduce

1. In the Claude Code iOS app, compose a message and attach one or more images (e.g. screenshots).
2. Send the message.
3. The assistant receives a text-only message with no image.

Confirmed live

In a single session, multiple screenshots attached and were received correctly across several consecutive messages — then a later message with an attached screenshot arrived to the assistant as text-only. The assistant explicitly confirmed it received no image, which points to the drop happening on the send/upload path rather than rendering.

Frequency

Intermittent, ongoing for ~1 week. Persists after updating to the latest app version (updated 2026-06-16).

Expected

Attached images upload and are visible to the assistant.

Actual

Message sends text-only; images are silently dropped (no error, no retry).

Environment

• Platform: Claude Code iOS app
• App version: latest available as of 2026-06-16 (updated that morning)
• Device / iOS version: _to be added in a comment_