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I installed the same app on both Free and Standard Jira site in order to test and check if there are any restrictions, but on both the app was not visible on tickets or the Apps menu.
Checking their documentation, it shows that it's necessary to connect Timely with Jira using the add-on. With that said, only the add-on on the site won't work.
Please, check the information on the link below:
Hope this helps!
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