How does the texture frame thing work in current version?

[moniker 67]

Example, im trying to change the oak wood texture for this rig box:

 

https://www.mineimatorforums.com/index.php?/topic/42321-the-simple-but-pretty-wooden-box-rig/

 

I open box.object, shows up fine. Then I open Arcade blocks frame.png with paint, change the oak wood, reload the texture on Mineimator and I see the spongue texture sort of stretched, weird.

 

How can I change the oak texture there with another texture? The box itself, not the top which uses an item frame.

Edited September 7, 2019 by moniker