Photoshop CS6 to Affinity Photo layerd TIFF round trip?

[earlybird]

Hi,
 I am experiencing the fact that a TIFF file with layers, that I prepare in Photoshop CS6, can be opened in Affinity Photo, but if I save this TIFF file in Affinity Photo,  Photoshop will no longer recognize the layers and so the image apperas to have been flattened. If I open this TIFF file back up in Affinity Photo the layers are still recognized.

 When I save the TIFF in Affinity Photo I do not see any options for TIFF formatting, which is something I am familiar with when using Photoshop.

 Is there some setting or combination of choices I may use to keep the layered TIFF accessible by Photoshop?

 Thank you. 

[kers]

yes you are right, but you can export it as apsd file and then it works.
About compression of tif: it seems affinity makes the choice how to compress. Not sure what they do, but they also seem to compress 16 bit tiff files ...