How can I make an animated GIF play when using a Slack file in an Image Block?

Package

I don't know

Question

Description

An animated GIF referenced through a Slack File object behaves differently depending on where the image element is used.

• A top-level Image Block displays a static PNG thumbnail on Slack Web.
• The same Slack file used as a Section accessory displays the animated GIF correctly.
• On the Slack mobile app, the GIF animates in both cases.

Is there a way to make an animated GIF play when specifying a Slack file in an Image Block?

SDK Version

@slack/bolt: 4.7.0, @slack/web-api: 7.15.1, @slack/types: 2.20.1

Node.js Version

v22.23.2

Additional Context

{
  "blocks": [
    {
        "type": "image",
        "slack_file": {
        "id": "F0123456"
        },
        "alt_text": "Animated GIF not working"
    },
    {
        "type": "image",
        "image_url": "https://files.slack.com/files-xxx/T0123456-F0123456/xxx.gif"
        "alt_text": "Animated GIF not working"
    },
    {
      "type": "section",
      "text": {
        "type": "mrkdwn",
        "text": "*Animated GIF test*"
      },
      "accessory": {
        "type": "image",
        "slack_file": {
          "id": "F0123456"
        },
        "alt_text": "Animated GIF working"
      }
    }
  ]
}

No repository file or test is named. Start by reproducing the supplied Image Block and Section accessory cases with the listed Slack SDK versions on Slack Web and mobile, then compare the documented behavior for slack_file and image_url. Done means confirming whether the SDK can affect playback or documenting the platform limitation and supported workaround.