Can the BeforeUpload event support promises?

[941477276]

Many times we upload files to a third-party server instead of uploading them directly to our own server. Before uploading to a 3rd party server, you usually need to call the interface to get some data and then actually upload the file to the 3rd party server.          The current BeforeUpload event does not support return promise, hope that plupload can support it!

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