ChatGPT desktop conversations not syncing to web or iOS

Several conversations visible in the ChatGPT Mac desktop app are absent from chatgpt.com and the ChatGPT iPhone app under the same OpenAI account.

Most important example

“MFL Master / continuation” is visible and pinned in the Mac desktop app but is completely absent from ChatGPT web and the iPhone app. Searching for the exact title on the web does not locate it.

The problem is broader than one conversation. “MFL Verified Master Audit” appears in the Mac app’s Recents list but does not appear in the corresponding visible web Chats list. Side-by-side screenshots show that the desktop Recents inventory and web Chats inventory do not match.

I never intentionally created these conversations as local-only Work chats. The interface did not clearly warn me that these conversations would remain only on one computer or give me an intentional choice to prevent cloud synchronization.

Steps to reproduce

1. Sign in to the same OpenAI account in the ChatGPT Mac app, chatgpt.com and the ChatGPT iPhone app.
2. In the Mac app, view Pinned and Recents.
3. Confirm that “MFL Master / continuation” appears under Pinned and “MFL Verified Master Audit” appears under Recents.
4. Open ChatGPT web and the iPhone app under the same account.
5. Search and browse the available conversations.
6. “MFL Master / continuation” is absent from both web and iPhone, and the overall conversation inventories do not match.

Expected behavior

Cloud Chat and Work conversations should synchronize across desktop, web and mobile. If a conversation is being created as local-only, that status should be explicit before work begins.

Please determine why these conversations are not synchronizing, restore cloud access without losing their contents, and clarify how users can identify and prevent local-only conversations.

Business impact

These are active business records. If I am away from my computer and have only my phone, I cannot access or continue essential work. Reconstructing or manually duplicating long conversations is not a practical workaround.

System information

ChatGPT subscription: Pro
Mac desktop app: 26.803.61601
Initially reported under: 26.803.41515
Computer: macOS, Apple silicon/arm64
Other affected surfaces: chatgpt.com in Safari and ChatGPT iPhone app
Model visible during documentation: GPT-5.6 Sol Light, although the synchronization failure does not appear model-specific

Timeline

First formally reported August 10, 2026. The problem remains unresolved on August 12, 2026 and persisted after the desktop application updated.

Existing diagnostic Feedback ID

no-active-thread-019fedb4-03eb-7f73-952a-e3e955d89a34

No repository files, tests, or implementation entry points are identified. Start by reproducing the account and conversation mismatch across the Mac app, chatgpt.com, and iPhone app using the listed conversation titles; the issue is resolved when cloud conversations appear consistently across all three surfaces without content loss and local-only status is explicit.