Inline base64 image is not displaying in Android app

[tonyzzz321]

Summary

Markdown inline image source in base64 strips the base64 content.

Environment Information

• Device Name: Pixel 6A
• OS Version: Android 14
• Mattermost App Version: 2.19.2
• Mattermost Server Version: 9.11.1

Steps to reproduce

Insert an base64 encoded image using inline markdown

Hello World ![Hello World](data:image/png;base64,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)

Expected behavior

<- this is what I see in the web client (Chrome)

Observed behavior (that appears unintentional)

<- this is what I see in the android app

Possible fixes

:)

[amyblais]

Opened https://mattermost.atlassian.net/browse/MM-60377.

[larkox]

Due to how we handle images, we currently don't give any support for base64 images on mobile, and it is not something we plan to support on the near future.

Images are processed by the server and add metadata about the image sizes. The mobile app doesn't show the images if there is no metadata about them. This is done to properly calculate the elements sizes and avoid the screen jumping around when images are loaded.