How to use custom request for n-upload when trigger and list are split?

[hlf20010508]

I used n-upload in my Wrapper component. All other components were in the slot.

<template>
    <n-spin :show="showRefreshSpin">
        <n-message-provider>
            <n-upload abstract :file-list="uploadList" :multiple="true" :custom-request="uploadFile">
                <slot></slot>
            </n-upload>
        </n-message-provider>
    </n-spin>
</template>

And in UploadFile component, I used n-upload-trigger and n-upload-file-list for a test.

<template>
    <ControlItemBase>
        <n-upload-trigger #="{ handleClick }" abstract>
            <Folder @click="handleClick" />
        </n-upload-trigger>
        <div>
            <n-upload-file-list />
        </div>
    </ControlItemBase>
</template>

I thought the handleClick would be override by custom-request but actually not. I could determine this in my console log.

So how do I use custom-request in this situation?