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Yes you can send files to your SQL sever by POST method. You can follow this guide to enable POST http://www.jotform.com/help/51-How-to-Post-Submission-Data-to-Thank-You-Page. Once you have enabled POST you can now follow this guide to on how to create your custom thank you page to insert into your MySQL database http://www.jotform.com/help/126-How-to-send-Submissions-to-Your-MySQL-Database-Using-PHP.
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