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I am working on a Nintex new form which has an attachment control. If a user wants to attach multiple documents the user has to click on "Add Attachment" several times and add one file at a time. I have a requirements so the users are able to use Shift/Ctrl to select multiple files.

I have been able to utilize html "multiple" attribute on the <input type="file" multiple> control to allow users to upload multiple files. However, upon submitting the form, only the first attachment gets attached to the new item.

I was wondering if there is any documentation (I doubt this) or anyone knows where exactly in SharePoint js code is that that the attachments are being processed? I am thinking of intercepting that and extend it in a way that it iterates through the attached file rather than picking up only the first file.

closed as off-topic by Robert Lindgren, Gautam Sheth, Mohamed El-Qassas MVP Jun 14 '17 at 9:03

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