Syntax

$addThumbnail[url;(description);(spoiler);(sectionID)]

Parameters

Parameter	Required	Default	Description
url	Yes	—	URL of the image. It is not checked by the engine.
description	No	—	Alternative text. An empty value means no description.
spoiler	No	no	yes/true to mark the image as a spoiler, no/false otherwise. An empty value means no; any other value is an error (Expected yes or no, got "...").
sectionID	No	—	Name of a section defined earlier ($addSection[name]): the thumbnail becomes its accessory. A name that does not exist raises Section <name> not found. Without it, the thumbnail goes to the section opened last.

Return value

None (empty string). If a section was opened with $addSection (and not closed by a separator, file, gallery, container, action row or select menu), the thumbnail becomes the accessory of that section. Otherwise it is added as a standalone component.

Components V2 message

A thumbnail is a rich (Components V2) component. A message that contains one is sent as a Components V2 message, which cannot carry text content or embeds: use $addTextDisplay[] for the text, which is added to the open section.

Examples

User avatar

$addContainer[profile;#5865F2;no]
$addSection
$addTextDisplay[Profile of $username]
$addThumbnail[$authorAvatar;Avatar of $username]

Server icon

$addContainer[server_info;#2ECC71;no]
$addSection
$addTextDisplay[Server: $serverName]
$addThumbnail[$serverIcon;Server icon]

Spoiler image

$addContainer[secret_content;#E74C3C;no]
$addSection
$addTextDisplay[Click to reveal the image...]
$addThumbnail[$var[hidden_image];Secret image;yes]

In a complex layout

$addContainer[catalog;#9B59B6;no]

$addSection
$addTextDisplay[Fire sword - 5000 gold]
$addThumbnail[https://cdn.example.com/item1.png;Fire sword]

$addSection
$addTextDisplay[Ice shield - 3500 gold]
$addThumbnail[https://cdn.example.com/item2.png;Ice shield]

Notes

• Use it right after $addSection (itself usually after $addContainer) to attach it to a section.
• Do not confuse this with $thumbnail[] which defines the thumbnail of a classic embed.
• For a gallery of multiple images, use $addMediaGallery[].