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I would like to add a drop Down list where I have the name of all users. I would like to select the persons from the list
Kalid, if all you want is a drop down with information take a look at the easy drop-down menu add-on. https://marketplace.atlassian.com/plugins/eps.focuspro.EasyDropdownMenu/server/overviewIf your looking for something connected to the user database try the @mention function. It will auto complete user names for you.