Hi there!
It indeed will not work. As stated on the help file, all platforms have these settings fixed, so they can work properly:
Creating Platforms A platform is just a regular event with special effects. There are three types of platforms: Normal, Fall, and Carry. All Platform events have these settings, regardless of the event page settings: - Through = true - Frequency Speed = 5 (Highest) - Priority type = below the player
By default, platform need to be on hole tiles, defined by region or terrain ids, so they can work. Changing their priority to be above player, and make the player walk below a platform, means that the player will walk on a hole tile, which also cannot happen.
Can you try explain to me why do you want that, so we can try to find a workaround?
