4dkankan-components/docs/examples-bk/upload/manual.vue

<template>
    <el-upload ref="uploadRef" class="upload-demo" action="https://run.mocky.io/v3/9d059bf9-4660-45f2-925d-ce80ad6c4d15" :auto-upload="false">
        <template #trigger>
            <el-button type="primary">select file</el-button>
        </template>

        <el-button class="ml-3" type="success" @click="submitUpload"> upload to server </el-button>

        <template #tip>
            <div class="el-upload__tip">jpg/png files with a size less than 500kb</div>
        </template>
    </el-upload>
</template>
<script lang="ts" setup>
import { ref } from 'vue'
import type { UploadInstance } from 'element-plus'

const uploadRef = ref<UploadInstance>()

const submitUpload = () => {
    uploadRef.value!.submit()
}
</script>