Mobile image caption (alt text) not displayed on desktop/web clients

[bearvorkuta]

Description:

When a user sends an image with a caption from the mobile app,
the caption text is not visible on desktop clients (Windows/Linux/Web).

Steps to reproduce:

1. Open Rocket.Chat on mobile
2. Send an image with a text caption
3. Open the same channel on desktop app or web browser
4. The caption text is missing

Expected behavior:

Caption text should be visible below or above the image.

Actual behavior:

Caption text is only stored in the alt attribute of the <img> tag
and is not rendered as visible text on desktop.

Root Cause (HTML analysis)

Mobile message — text only in alt, no rcx-message-body block:

Mobile User

IMG_6827.jpg

(48.76 kB)

Desktop message — text in separate rcx-message-body block, alt is empty:

Desktop User

Text sent from desktop as separate message body

Clipboard - screenshot.png

(21.94 kB)

Server Setup Information:

• Version of Rocket.Chat Server: 8.4.0
• License Type: Starter
• Number of Users: 41
• Operating System: Rocky Linux 9.7
• Deployment Method: docker
• Number of Running Instances: 1
• DB Replicaset Oplog: Not configured
• NodeJS Version: v22.16.0
• MongoDB Version: 8.0.21 / wiredTiger

Client Setup Information

• Desktop App or Browser Version:
• Operating System: Ubuntu 24 - 4.14.1, Windows 11 - 4.14.0, IOS 26.5 - 4.72.0.108804, Android 15 - 4.72.0.108809

Additional context

Relevant logs:

[coderabbitai]

⚠️ Possible Duplicate Issue(s)

• Messages with mobile camera images not visible on desktop #40438

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[NihalShinde4933]

hey @bearvorkuta , can i work on this issue

[ZB-ZettaByte]

Hello! I'd like to work on this issue. I'll start by reproducing the mobile-to-web caption behavior locally, then check the web client's image rendering flow to see where the caption should be displayed.

[NihalShinde4933]

Hey @ZB-ZettaByte brother , I have raised a PR for it. Can you look for any other issue ?

[ZB-ZettaByte]

Thanks for the update @NihalShinde4933 . I'll avoid duplicating work on this issue since you already opened a PR.

[bearvorkuta]

эй @bearvorkuta , могу ли я работать над этим вопросом

@NihalShinde4933, hello, yes, of course