I have a collection of objects that uses textures, in the editor, they are shown in white (that's not a problem for me)

but when i export the model,  it doesnt't keep the uv map that was defined in the .obj file, and the result is incorrect (i think because of auto texturing ?)

can you fix it ?

Note : i would be very handy to have an option to not overwrite the object's uv cooridnates

Asset Forge creates custom UV properties to make sure that textures are always the same size no matter the size of the block they're applied to. Custom blocks can't (and shouldn't) contain a UV map as this is unsupported. Please see this page.

it is not possible to have an option to disable the uv overwriting ?  i bought the snake temple assets from bigtem, and assetforge would be perfect to make the level using theses assets (blender would be overkill, or you know a plugin for blender that let me drag&drop assets to the scene)

Asset Forge doesn't support third party models other than those which are marked to work with Asset Forge, as described above the UV maps are generated in the application and don't get imported.