Write a plugin that uses Citrix ShareFile API.
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Plugin Admin area accepts required API and user credentials.
Creates shortcode that does following when inserted in to a page or a form (contact form 7).
Allows site visitor to upload multiple files.
Each file gets uploaded to a specific folder on sharefile.
Upload should automatically start, user only browse and select files. Better if drag and drop is available.
When each file is uploaded, a direct url to file on sharefile is generated and returned to wordpress page or form to be emailed to admin along with filename, uploadtime stamp. Multiple file urls are collected and sent as single form submission.
Quote a fix price and firm time to deliver. Do not commit if you cannot complete the job.