why I can't enable multiwindow on Instagram app?

[haithamelloumi99]

As I know I can enable multiwindow on Instagram and Youtube app on Galaxy S6 or S7 but I can't do it on the Galaxy S8, how can I enable this?

 

[Qc_Anubis]

By default it dosen't seem to be compatible with multi-window (just checked it out myself and no option here either) works with any other app i have though.