Having an issue with OSTicket v1.9.12. Can't seem to upload any kind of file when opening a ticket. This is only on IE11. Tested in Chrome and it works with no issues however I need this to work in IE11 as well. Some reading has led me to believe that this won't work in IE11 due to some compatibility issues with Java, but I figured I'd ask anyway.When trying to upload a file I either get the hanging upload bar that never completes or the undefined400 error message.Any help would be greatly appreciated.Thank you.

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1.9.12 is quite old.  You might want to try upgrading to the current version for that branch (1.9.16) or to the current version (1.10.1 as of this writing).

3 years later

I'm using OSTicket 1.14.3 the same error is displayed in Google Chrome and Microsoft Edge.
Txt files are allowed. Images and pdf files displayed the error undefined 400.

@pixelgroup
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