Starting to see posts about tax returns being requested as an additional document - I’ve been traveling so don’t have a tax return - any advice?

The proposal to impose income tax on worldwide income regardless of it being remitted to Thailand on all those who are resident for 180 days or more irrespective of visa status has now reached draft proposal status this means the Thai government may well vote on this matter soon and make an announcement in the Royal Gazette. If this was to become law, "last man out, put the cat out" Since there are still 4 months till year end this could be implemented by 1st jan 2025.