Mobile app records audio as AAC; Telegram channel attachment fails (WEBPAGE_CURL_FAILED) while web app MP3 works

[p30arena]

Bug

When replying with an audio attachment from the Chatwoot mobile app, the app uploads/attaches an .aac file.
When the inbox is a Telegram channel, Telegram fails to deliver the attachment with:

400, Bad Request: failed to send message #1 with the error message "WEBPAGE_CURL_FAILED"

However, sending audio from the web app works (it uploads MP3), and Telegram delivers it successfully.

This suggests the mobile app audio encoding/container is incompatible with what the Telegram integration expects.

Steps to reproduce

1. Connect a Telegram inbox/channel in Chatwoot (self-hosted or cloud).
2. From Chatwoot web app, record/send audio -> Telegram receives it (works).
3. From Chatwoot mobile app, record/send audio -> message fails in Telegram with WEBPAGE_CURL_FAILED.

Expected behavior

Mobile app audio attachments should be delivered to Telegram, same as web app.

Actual behavior

Mobile app audio attachments fail on Telegram inbox with:
WEBPAGE_CURL_FAILED

Evidence / logs

Chatwoot server log shows:

• Attachment uploaded as .aac (example):
  .../rails/active_storage/blobs/redirect/.../audio-1.aac
• Telegram error:
  400, Bad Request: failed to send message #1 with the error message "WEBPAGE_CURL_FAILED"

Also, the .aac URL is reachable publicly (302 -> 200) via curl, so this does not look like a simple "blocked file" case.

Environment

• Chatwoot: self-hosted
• Mobile app: Chatwoot official mobile app (React Native)
• Telegram: Chatwoot Telegram channel integration
• Reverse proxy/CDN: Cloudflare (but web MP3 works, mobile AAC fails)

Proposed fix / direction

• Make mobile audio recording use a Telegram-friendly format:
  • Prefer m4a (AAC in MP4 container) or mp3, matching web behavior.
  • Or if Telegram integration treats it as a voice note (sendVoice), encode as ogg/opus.
• Ensure mobile app sets correct MIME type and extension.
• Ideally align mobile audio attachment format with web app for consistency.