correctly opening Tiff with layers

[scatolabox]

your research is deep and accurate, thank you very much. I understand that you have done everything possible and that there are copyright limits between the two apps. But (you know if) there will be the possibility in the future to "read" these files well in the new versions of gimp? Or a plugin that will sooner or later be developed?

Which is the multi-layer file most compatible with all apps at the moment that you know?

Thank you very very much