I've recently set up OSTicket. Everything appears to work great and I really like it except I'm unable to upload any files. On the client side i get an "File upload Error, Undefined500." On the agent side I can't upload new logos. I get "File upload error #6". I assume they are related, but not sure.Here is my server information:osTicket Version v1.10.1 (9ae093d) — Up to dateWeb Server Software Microsoft-IIS/10.0MySQL Version 8.0.11PHP Version 7.2.5I'm using the Attachments on File System plugin. It is set to 2MB maximum size with IIS_IUSRS users having write privileges to the directory. PHP.ini also has file uploads enabled with 2MB file size.The logs in OSTicket don't show any issues. The IIS logs show this when I try a client side file upload:2018-05-18 15 10.0.0.50 POST /helpdesk/ajax.php/form/upload/attach - 80 - 10.0.7.36 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/66.0.3359.139+Safari/537.36 http://10.0.0.50/helpdesk/tickets.php?id=4 500 0 0 187I'm sure I'm missing something simple, can't figure out what it is. Any suggestions?