feats

src/pages/mpSetting/components/MiniAppMedia.jsx

     <div>
       <Upload
         name="file"
-        accept=".png, .jpg, .jpeg, .gif"
+        accept=".jpg, .jpeg"
         listType="picture-card"
         fileList={fileList}
         customRequest={customRequest}

src/pages/mpSetting/index.jsx

             props.form.getFieldDecorator('aesKey')(<Input placeholder="请填写 AES_KEY" readOnly />)
           }
         </Form.Item>
-        <Form.Item label="小程序封面">
+        <Form.Item label="小程序封面" help="图片建议大小为520*416">
           <MiniAppMedia onChange={handleMiniAppChange} value={detailData.miniapp_url} />
         </Form.Item>
       </Form>