- * @param InputFile|string $thumbnail A .WEBP or .PNG image with the thumbnail, must be up to 128 kilobytes in size and have a width and height of exactly 100px, or a .TGS animation with a thumbnail up to 32 kilobytes in size (see <a href="https://core.telegram.org/stickers#animated-sticker-requirements"><a href="https://core.telegram.org/stickers#animated-sticker-requirements">https://core.telegram.org/stickers#animated-sticker-requirements</a></a> for animated sticker technical requirements), or a WEBM video with the thumbnail up to 32 kilobytes in size; see <a href="https://core.telegram.org/stickers#video-sticker-requirements"><a href="https://core.telegram.org/stickers#video-sticker-requirements">https://core.telegram.org/stickers#video-sticker-requirements</a></a> for video sticker technical requirements. Pass a <em>file_id</em> as a String to send a file that already exists on the Telegram servers, pass an HTTP URL as a String for Telegram to get a file from the Internet, or upload a new one using multipart/form-data. <a href="https://core.telegram.org/bots/api#sending-files">More information on Sending Files »</a>. Animated and video sticker set thumbnails can't be uploaded via HTTP URL. If omitted, then the thumbnail is dropped and the first sticker is used as the thumbnail.
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