File upload keeps composer disabled for ~1–2 min after switching ChatProfile (webapp)

[deepak-joshi-colombo-and-hurd]

Version : Chainlit 2.9.3 (also seen on 2.9.2)
Environment: macOS, Chrome; app running via chainlit run backend/src/app.py -w
Description: After switching ChatProfile, attaching a file (PDF/DOCX) causes the message composer/Send button to remain disabled for ~60–120s. The upload request eventually returns 200 OK, then Send re-enables.
Steps to Reproduce:
Start app.
Switch ChatProfile (e.g., chatProfile1 -> chatProfile2).
Attach a PDF/DOCX via the input paperclip and write up some text.
Observe Send button disabled for a long time.
Expected: Upload finishes quickly and Send is re-enabled immediately (or within a few seconds).
Actual: Upload request stays “pending” for a long time; Send remains disabled until it finishes.
Evidence:
Network: POST /project/file?session_id=... eventually returns 200 OK after ~1–2 minutes.

[dosubot]

This is a known issue related to session or thread management after switching ChatProfile—others have reported that the Send button and other UI elements can remain disabled until the session is reset, especially in Copilot mode. The root cause seems to be a mismatch or stale state in the backend after a profile switch, which can break UI responsiveness and delay file uploads. A temporary workaround is to click "New Chat" after switching profiles, which resets the session and re-enables the buttons immediately. Reviewing backend logs and browser console errors during the delay may help pinpoint the exact cause. The issue is still being reported in recent versions, so monitoring for updates or patches related to session management and ChatProfile switching is recommended. More details and user reports can be found here.

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[github-actions]

This issue is stale because it has been open for 14 days with no activity.

[github-actions]

This issue was closed because it has been inactive for 7 days since being marked as stale.