ant-design/components/upload/demo/upload-png-only.md

## zh-CN

`beforeUpload` 返回 `false` 或 `Promise.reject` 时，只用于拦截上传行为，不会阻止文件进入上传列表（[原因](https://github.com/ant-design/ant-design/issues/15561#issuecomment-475108235)）。如果需要阻止列表展现，可以通过返回 `Upload.LIST_IGNORE` 实现。

## en-US

`beforeUpload` only prevent upload behavior when return false or reject promise, the prevented file would still show in file list. Here is the example you can keep prevented files out of list by return `UPLOAD.LIST_IGNORE`.
docs: :clapper: add Upload demo about beforeUpload usage 2020-08-07 17:07:54 +08:00			`## zh-CN`

refactor: Upload use batch start (#29474) * chore: Update Upload version * useMergedStatus * fix file list parser * fix list replacement * bump rc-upload * add Upload.LIST_IGNORE * support LIST_IGNORE * fix uploadList batch test * test: fix batch case test case changed * test: Finish test case * fix: Not change uid if exist * use proxy * fix proxy * fix ts * part test case check * more test back * back of test all * update test case * more unmount * adjust test cae * add unmount 2021-02-26 15:18:37 +08:00			`beforeUpload` 返回 `false` 或 `Promise.reject` 时，只用于拦截上传行为，不会阻止文件进入上传列表（[原因](https://github.com/ant-design/ant-design/issues/15561#issuecomment-475108235)）。如果需要阻止列表展现，可以通过返回 `Upload.LIST_IGNORE` 实现。
docs: :clapper: add Upload demo about beforeUpload usage 2020-08-07 17:07:54 +08:00
			`## en-US`

refactor: Upload use batch start (#29474) * chore: Update Upload version * useMergedStatus * fix file list parser * fix list replacement * bump rc-upload * add Upload.LIST_IGNORE * support LIST_IGNORE * fix uploadList batch test * test: fix batch case test case changed * test: Finish test case * fix: Not change uid if exist * use proxy * fix proxy * fix ts * part test case check * more test back * back of test all * update test case * more unmount * adjust test cae * add unmount 2021-02-26 15:18:37 +08:00			`beforeUpload` only prevent upload behavior when return false or reject promise, the prevented file would still show in file list. Here is the example you can keep prevented files out of list by return `UPLOAD.LIST_IGNORE`.