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Called HEAT Support with the same issue. Here is their response: "This issue was reported in Chrome build 61.0.3163.91. Customer's Chrome build is 61.0.3163.100. Customer tested in Firefox and upload attachment worked without issue. This issue has been reported on RM 254449 and fix is provided in Ivanti Service Management v2017.3"
For customers that need to upload attachments, or for moving metadata configuration changes we switched to Firefox. IE works fine too. Hope this helps.
I'm moving this discussion to the Ivanti Service Management discussion group.