在Discord.py中嵌入时使用本地文件作为set_thumbnail

import discord
from discord.ext import commands

bot = commands.Bot(command_prefix='!')

@bot.command()
async def set_thumbnail(ctx, file_path):
    # 读取本地文件
    with open(file_path, 'rb') as file:
        file_data = file.read()

    # 创建一个嵌入消息对象
    embed = discord.Embed()
    embed.set_thumbnail(url="attachment://thumbnail.png")  # 设置缩略图的URL

    # 发送嵌入消息和文件
    await ctx.send(file=discord.File(file_data, filename='thumbnail.png'), embed=embed)

bot.run('YOUR_BOT_TOKEN')