Syntax

$editThumbnail[Position;URL;(Description;Spoiler;Message ID)]

Parameters

Parameter	Description
Position	Rank of the thumbnail, counted from 1 in reading order. Otherwise Position must be a positive whole number.
URL	New image URL. Must not be empty (Thumbnail URL must not be empty.).
Description	(Optional) Alternative text, 0 to 1024 characters (Description must contain 0 to 1024 characters.).
Spoiler	(Optional) yes/true hides the image behind a spoiler. Empty or no means no spoiler. Any other value raises Expected yes or no, got "<value>".
Message ID	(Optional) ID of a message sent by the bot (a positive integer, otherwise Invalid message ID.).

Behavior

• Like $editButton, the thumbnail is replaced: what is omitted goes back to its default (no description, no spoiler).
• No such thumbnail: Thumbnail <n> not found.
• With Message ID, the message is read and rewritten when the response is flushed; its Components V2 layout and flag are kept.
• Without Message ID, in the script run for a click, it edits the clicked message. Elsewhere, it edits the layout being built.
• Only a message written by the bot can be edited (Only bot-authored message components can be edited.); an ephemeral message cannot be edited by its ID. A classic message has no thumbnail component, and only $editMessageCV2 can convert it (irreversibly).

Examples

Button in an interactionCreate workflow

Workflow with the event interactionCreate and the custom ID filter (customIdFilter) show_avatar. $customID only exists in the script run for the click, never in the slash command.

$editThumbnail[1;$authorAvatar;Avatar of $username]

Spoiler on a message chosen by its ID

$editThumbnail[2;https://example.com/secret.png;Secret;yes;$message[1]]

Notes

• Do not confuse it with $thumbnail, the thumbnail of a classic embed.
• To add a thumbnail, use $addThumbnail.