Bad texture UV when exporting entity for MC PE

[Galingueur]

Hello,

I'm trying to adapt my mobs model from java to MC PE.
I export the different part of my mob with JS: Minecraft PE entity part model, then, I overwrite the mob texture with my own texture from the java version which includes all elements of my models (head, body, leg, ect...)

When I export a part (for example, the leg) the UV is reset to the 0,0 position, I always need to reset the UV value in the mobs.json file to fit with the texture.

Is there a way to export for MCPE keeping the all-in-one texture that i used for MC java ?

Also, which is the fastest method to export model for MCPE ?

Thx !

Galingueur_