diff --git a/docs/docs/en.md b/docs/docs/en.md
index f26e7b1..2c0b0d5 100644
--- a/docs/docs/en.md
+++ b/docs/docs/en.md
@@ -618,9 +618,12 @@ Add, update, remove pre-filter
   If the `oldFile` value is `undefined` 'is added
   If `newFile`, `oldFile` is exist, it is updated
 
+  > Synchronization modify `newFile`  
+  > Asynchronous Please use `update`,` add`, `remove`,` clear` method
+  > Asynchronous Please set an error first to prevent being uploaded
 
-  > You can not use `update`,` add`, `remove`,` clear` methods in the event  
-  >The `newFile` object can be modified within the event  
+  > Synchronization can not use `update`,` add`, `remove`,` clear` methods  
+  > Asynchronous can not modify `newFile`  
 
 * **Usage:**  
   ```html
@@ -717,11 +720,6 @@ Add, update, remove after
       inputFile(newFile, oldFile) {
         if (newFile && !oldFile) {
           // Add file
-
-          // Automatic upload
-          if (!this.$refs.upload.active) {
-            this.$refs.upload.active = true
-          }
         }
 
         if (newFile && oldFile) {
@@ -764,6 +762,13 @@ Add, update, remove after
             // });
           }
         }
+
+        // Automatic upload
+        if (Boolean(newFile) !== Boolean(oldFile) || oldFile.error !== newFile.error) {
+          if (!this.$refs.upload.active) {
+            this.$refs.upload.active = true
+          }
+        }
       }
     }
   }
diff --git a/docs/docs/zh-cn.md b/docs/docs/zh-cn.md
index 792e8c3..7b09a56 100644
--- a/docs/docs/zh-cn.md
+++ b/docs/docs/zh-cn.md
@@ -612,8 +612,13 @@ Add, update, remove pre-filter
   如果 `oldFile` 值为 `undefined` 则是添加  
   如果 `newFile`, `oldFile` 都存在则是更新
 
-  > 事件内不可使用 `update`, `add`, `remove`, `clear` 方法  
-  事件内可修改 `newFile` 对象
+  > 事件内同步处理请直接修改 `newFile`  
+  > 事件内异步处理请使用 `update`, `add`, `remove`, `clear` 方法
+  > 异步请先设置一个错误以防止被上传
+
+  > 同步不能使用 `update`, `add`, `remove`, `clear` 方法  
+  > 异步不能修改 `newFile`
+
 
 * **示例:**  
   ```html
@@ -709,11 +714,6 @@ Add, update, remove pre-filter
       inputFile(newFile, oldFile) {
         if (newFile && !oldFile) {
           // 添加文件
-
-          // 自动上传
-          if (!this.$refs.upload.active) {
-            this.$refs.upload.active = true
-          }
         }
 
         if (newFile && oldFile) {
@@ -756,6 +756,13 @@ Add, update, remove pre-filter
             // });
           }
         }
+
+        // 自动上传
+        if (Boolean(newFile) !== Boolean(oldFile) || oldFile.error !== newFile.error) {
+          if (!this.$refs.upload.active) {
+            this.$refs.upload.active = true
+          }
+        }
       }
     }
   }
diff --git a/docs/views/examples/Full.vue b/docs/views/examples/Full.vue
index 82d6d16..bc4e421 100644
--- a/docs/views/examples/Full.vue
+++ b/docs/views/examples/Full.vue
@@ -59,12 +59,12 @@
                   Action
                 </button>
                 <div class="dropdown-menu">
-                  <a :class="{'dropdown-item': true, disabled: file.active || file.success}" href="#" @click.prevent="file.active || file.success ? false :  onEditFileShow(file)">Edit</a>
+                  <a :class="{'dropdown-item': true, disabled: file.active || file.success || file.error === 'compressing'}" href="#" @click.prevent="file.active || file.success || file.error === 'compressing' ? false :  onEditFileShow(file)">Edit</a>
                   <a :class="{'dropdown-item': true, disabled: !file.active}" href="#" @click.prevent="file.active ? $refs.upload.update(file, {error: 'cancel'}) : false">Cancel</a>
 
                   <a class="dropdown-item" href="#" v-if="file.active" @click.prevent="$refs.upload.update(file, {active: false})">Abort</a>
-                  <a class="dropdown-item" href="#" v-else-if="file.error && $refs.upload.features.html5" @click.prevent="$refs.upload.update(file, {active: true, error: '', progress: '0.00'})">Retry upload</a>
-                  <a :class="{'dropdown-item': true, disabled: file.success}" href="#" v-else @click.prevent="file.success ? false : $refs.upload.update(file, {active: true})">Upload</a>
+                  <a class="dropdown-item" href="#" v-else-if="file.error && file.error !== 'compressing' && $refs.upload.features.html5" @click.prevent="$refs.upload.update(file, {active: true, error: '', progress: '0.00'})">Retry upload</a>
+                  <a :class="{'dropdown-item': true, disabled: file.success || file.error === 'compressing'}" href="#" v-else @click.prevent="file.success || file.error === 'compressing' ? false : $refs.upload.update(file, {active: true})">Upload</a>
 
                   <div class="dropdown-divider"></div>
                   <a class="dropdown-item" href="#" @click.prevent="$refs.upload.remove(file)">Remove</a>
@@ -164,6 +164,13 @@
       <label for="minSize">Min size:</label>
       <input type="number" min="0" id="minSize" class="form-control" v-model.number="minSize">
     </div>
+    <div class="form-group">
+      <label for="autoCompress">Automatically compress:</label>
+      <input type="number" min="0" id="autoCompress" class="form-control" v-model.number="autoCompress">
+      <small class="form-text text-muted" v-if="autoCompress > 0">More than {{autoCompress | formatSize}} files are automatically compressed</small>
+      <small class="form-text text-muted" v-else>Set up automatic compression</small>
+    </div>
+
     <div class="form-group">
       <div class="form-check">
         <label class="form-check-label">
@@ -172,6 +179,7 @@
       </div>
       <small class="form-text text-muted">Add a file list to start the location to add</small>
     </div>
+
     <div class="form-group">
       <div class="form-check">
         <label class="form-check-label">
@@ -374,6 +382,7 @@
 
 <script>
 import Cropper from 'cropperjs'
+import ImageCompressor from '@xkeshi/image-compressor'
 import FileUpload from 'vue-upload-component'
 export default {
   components: {
@@ -405,7 +414,7 @@ export default {
         '_csrf_token': 'xxxxxx',
       },
 
-
+      autoCompress: 1024 * 1024,
       uploadAuto: false,
       isOption: false,
 
@@ -473,6 +482,24 @@ export default {
         if (/\.(php5?|html?|jsx?)$/i.test(newFile.name)) {
           return prevent()
         }
+
+        // Automatic compression
+        // 自动压缩
+        if (newFile.file && newFile.type.substr(0, 6) === 'image/' && this.autoCompress > 0 && this.autoCompress < newFile.size) {
+          newFile.error = 'compressing'
+          const imageCompressor = new ImageCompressor(null, {
+            convertSize: Infinity,
+            maxWidth: 512,
+            maxHeight: 512,
+          })
+          imageCompressor.compress(newFile.file)
+            .then((file) => {
+              this.$refs.upload.update(newFile, { error: '', file, size: file.size, type: file.type })
+            })
+            .catch((err) => {
+              this.$refs.upload.update(newFile, { error: err.message || 'compress' })
+            })
+        }
       }
 
 
@@ -535,8 +562,10 @@ export default {
 
 
       // Automatically activate upload
-      if (newFile && !oldFile && this.uploadAuto && !this.$refs.upload.active) {
-        this.$refs.upload.active = true
+      if (Boolean(newFile) !== Boolean(oldFile) || oldFile.error !== newFile.error) {
+        if (this.uploadAuto && !this.$refs.upload.active) {
+          this.$refs.upload.active = true
+        }
       }
     },