What version of the Codex App are you using (From “About Codex” dialog)?
26.1027.30824 (build 22943, production channel)
What subscription do you have?
ChatGPT Pro
What platform is your computer?
macOS / Apple silicon. uname -mprs: Darwin 25.5.0 arm64 arm
What issue are you seeing?
All Excel files I have tried currently fail to send in the desktop app, while PDF and other attachment types can be uploaded and sent successfully. The confirmed Excel format is .xlsx.
The Excel thumbnail appears in the composer. After entering a text instruction and clicking Send, the send control keeps spinning and both the file and text remain in the composer. The composer then becomes unresponsive, including the control for removing the attachment. No actionable error is shown.
This happens in both existing chats and a new chat. Restarting the app did not resolve it. It blocks my day-to-day spreadsheet workflow.
I noticed the issue around the recent app update, but I have not established that the update caused it.
What steps can reproduce the bug?
Feedback ID: 01a18e55-f9ad-7023-b185-d6e662130f5b
- Open an existing chat or a new chat in the macOS desktop app.
- Attach a local Excel (.xlsx) workbook. A spreadsheet preview appears in the composer.
- Enter a text instruction and click Send.
- Observe that the send control keeps spinning, the file and text remain in the composer, and the request is not submitted.
- Try to remove the attachment or edit the input area; the affected composer is unresponsive.
- Repeat with a different Excel file or in a new chat: the same problem occurs.
Comparison: PDF and other attachment types can be sent. Restarting the application does not resolve the Excel issue.
What is the expected behavior?
Excel attachments should become ready and the message should be submitted normally. If preparation or submission fails, the app should show an actionable error and restore the composer controls so I can cancel, remove the file, or retry.
Additional information
Observed on October 30, 2026. The updater currently reports no eligible update for this installation.
Workaround verified in this workflow: send the local workbook path as plain text and let the assistant read the original Excel file directly. This allowed spreadsheet work to continue; the attachment UI itself remains unresolved.
No definite Excel-specific failure or root cause was identified in the inspected app logs. I am not claiming that a particular log warning causes this issue.
Related report: https://github.com/openai/codex/issues/58302 describes a similar XLSX pending/spinning state on the same app version/build. This report adds another affected installation, with PDF attachments working and the issue also occurring in a new chat. A shared root cause has not been established.
Please investigate the Excel attachment preparation/submission flow and advise whether a fix or a supported workaround is available. Business workbooks, local user paths, and full logs are not included in this public report.
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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