set
inline fun setCustomEmojiStickerSetThumbnail(name: String, customEmojiId: String? = null): SetCustomEmojiStickerSetThumbnailAction
Use this method to set the thumbnail of a custom emoji sticker set. Returns True on success.
Parameters
name
Sticker set name
custom
Custom emoji identifier of a sticker from the sticker set; pass an empty string to drop the thumbnail and use the first sticker as the thumbnail.