Edge animate reload the composition unexpectedly

Hi there,
I don’t know why when I came back to Edge Animate it asked if I wanted to use this and reload the composition. I have to click Yes button because I don’t want to lose any unsaved changes. Does anyone know why this appears ? What is wrong ?
Regards !

File changed
TwitterAPlnew.html was changed outside of Edge Animate.
Do you want to reload the composition?
You will lose any unsaved changes.
