Check multifile input before it starts uploading


I’ve worked out a way to check the filename input of a Multifile uploader contains ‘.mp3’, but I’d like to have a workflow that checks for the file type before starting to upload, to prevent having to reset any successful uploads that may have been done before a wrong file is chosen. Is this possible?

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I worked out how to check for non-mp3 files and reset the input, but it still needs to upload the files before starting the workflow; input changed.

Here’s my solution:

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