Can I get a trial of Advanced Roadmaps on a Jira Cloud Free instance?
From the documentation published I can't work out whether it's possible or not.
If it's not possible what do I need?
Advanced Roadmaps (formerly Portfolio) is part of "Premium". You can get a trial of premium I believe so that should also grant you that trial of Advanced Roadmaps.
(not a 100% sure tho if you quality for a premium trials from Free or if you need Standard)