iOS Share Sheet: Allow choosing an existing chat instead of always creating a new one

When sharing a file, image, URL, or text from another iOS app to ChatGPT via the Share Sheet, the app always creates a new conversation.

For users who work on long-term projects, this quickly fills the chat list with many one-message conversations and makes it difficult to keep related files together.

Please add a chat picker before sending the shared content.

Suggested flow:

  • Share → ChatGPT
  • Choose an existing conversation (recent chats + search)
  • Or create a new conversation

This would make project-based workflows much more convenient and avoid unnecessary chat clutter.

Example use cases:

  • Adding photos to an existing travel journal
  • Sending files to an ongoing programming discussion
  • Continuing a mapping or research project in the same conversation

The current behavior is good for quick one-off questions, but users should have the option to continue an existing conversation directly from the iOS Share Sheet.