According to https://support.atlassian.com/jira-cloud-administration/docs/configure-advanced-issue-workflows/#Advancedworkflowconfiguration-postfunctions it should be possible to create a post function of type `Update Issue Custom Field`. However, I can't find it on my JIRA Server (8.13.1). Is this only available on JIRA Cloud? if not, how do I enable it?
Cloud has a couple of apps installed as part of the standard offering, one of them provides "update custom field". But Server does not include them automatically, so you'll need to find and add one. Scriptrunner is a good option (I would say that, I work for Adaptavist), but there are several which provide "update custom field" in the marketplace.
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