diff --git a/lib/bot.js b/lib/bot.js
index 179e84fe..b9aadbf0 100644
--- a/lib/bot.js
+++ b/lib/bot.js
@@ -389,17 +389,29 @@ export default class Yunzai extends EventEmitter {
   }
 
   async Buffer(data, opts = {}) {
-    if (Buffer.isBuffer(data)) return data
-    data = this.String(data)
-
-    if (data.startsWith("base64://"))
-      return Buffer.from(data.replace("base64://", ""), "base64")
-    else if (data.match(/^https?:\/\//))
-      return opts.http ? data : Buffer.from(await (await fetch(data, opts)).arrayBuffer())
-    else {
-      const file = data.replace(/^file:\/\//, "")
-      if (await this.fsStat(file))
-        return opts.file ? `file://${path.resolve(file)}` : fs.readFile(file)
+    if (!Buffer.isBuffer(data)) {
+      data = this.String(data)
+      if (data.startsWith("base64://")) {
+        data = Buffer.from(data.replace("base64://", ""), "base64")
+      } else if (data.match(/^https?:\/\//)) {
+        if (opts.http) return data
+        data = Buffer.from(await (await fetch(data, opts)).arrayBuffer())
+      } else {
+        const file = data.replace(/^file:\/\//, "")
+        if (await this.fsStat(file)) {
+          if (opts.file) return `file://${path.resolve(file)}`
+          const buffer = await fs.readFile(file)
+          if (typeof opts.size === "number" && buffer.length > opts.size)
+            return `file://${path.resolve(file)}`
+          return buffer
+        }
+      }
+    }
+
+    if (typeof opts.size === "number" && data.length > opts.size) {
+      const file = path.join("temp", ulid())
+      await fs.writeFile(file, data)
+      data = `file://${path.resolve(file)}`
     }
     return data
   }
@@ -412,12 +424,16 @@ export default class Yunzai extends EventEmitter {
         file.buffer = data.file
       } else {
         file.url = data.file.replace(/^base64:\/\/.*/, "base64://...")
-        file.buffer = await this.Buffer(data.file, opts)
+        file.buffer = await this.Buffer(data.file, {
+          ...opts, size: undefined,
+        })
       }
       if (Buffer.isBuffer(file.buffer)) {
-        file.type = await fileTypeFromBuffer(file.buffer)
+        file.type = await fileTypeFromBuffer(file.buffer) || {}
         file.md5 = md5(file.buffer)
         file.name ??= `${Date.now().toString(36)}.${file.md5.slice(0,8)}.${file.type.ext}`
+        if (typeof opts.size === "number" && file.buffer.length > opts.size)
+          file.buffer = await this.Buffer(data.file, opts)
       }
     } catch (err) {
       this.makeLog("error", ["文件类型检测错误", file, err])
diff --git a/plugins/adapter/ComWeChat.js b/plugins/adapter/ComWeChat.js
index ffb336ed..4d30f791 100644
--- a/plugins/adapter/ComWeChat.js
+++ b/plugins/adapter/ComWeChat.js
@@ -33,7 +33,9 @@ Bot.adapter.push(new class ComWeChatAdapter {
   }
 
   async uploadFile(data, file) {
-    file = await Bot.fileType(file, { http: true })
+    file = await Bot.fileType(file, {
+      http: true, size: 10485760,
+    })
     const opts = { name: file.name }
 
     if (Buffer.isBuffer(file.buffer)) {
diff --git a/plugins/adapter/GSUIDCore.js b/plugins/adapter/GSUIDCore.js
index 92b03038..8e51db6e 100644
--- a/plugins/adapter/GSUIDCore.js
+++ b/plugins/adapter/GSUIDCore.js
@@ -62,7 +62,9 @@ Bot.adapter.push(new class GSUIDCoreAdapter {
         i = { type: "text", text: i }
 
       if (i.file) {
-        i.file = await Bot.Buffer(i.file, { http: true })
+        i.file = await Bot.Buffer(i.file, {
+          http: true, size: 10485760,
+        })
         if (Buffer.isBuffer(i.file))
           i.file = `base64://${i.file.toString("base64")}`
       }
diff --git a/plugins/adapter/OPQBot.js b/plugins/adapter/OPQBot.js
index c7740d15..2242344d 100644
--- a/plugins/adapter/OPQBot.js
+++ b/plugins/adapter/OPQBot.js
@@ -38,7 +38,9 @@ Bot.adapter.push(new class OPQBotAdapter {
   async uploadFile(id, type, file) {
     const opts = { CommandId: this.CommandId[type] }
 
-    file = await Bot.Buffer(file, { http: true })
+    file = await Bot.Buffer(file, {
+      http: true, size: 10485760,
+    })
     if (Buffer.isBuffer(file))
       opts.Base64Buf = file.toString("base64")
     else if (file.match(/^https?:\/\//))
diff --git a/plugins/adapter/OneBotv11.js b/plugins/adapter/OneBotv11.js
index 248e6db9..5803775c 100644
--- a/plugins/adapter/OneBotv11.js
+++ b/plugins/adapter/OneBotv11.js
@@ -33,9 +33,11 @@ Bot.adapter.push(new class OneBotv11Adapter {
   }
 
   async makeFile(file, opts) {
-    file = await Bot.Buffer(file, { http: true, ...opts })
+    file = await Bot.Buffer(file, {
+      http: true, size: 10485760, ...opts,
+    })
     if (Buffer.isBuffer(file))
-      file = `base64://${file.toString("base64")}`
+      return `base64://${file.toString("base64")}`
     return file
   }