No .storyline file added

Hi everyone, 

I published a drag and drop exercice on my  articulate 360, it works just fine when i consult the url but when i want to use it n rise through add a bloc > interactive  > storyline project, it says No .storyline file added and it loading forever without finding my project(enclosed a print screen)... any idea what is the problem ? 

For info, my other usages of storyline in rise work but not that one.... 

I try to copie/paste the project or import it in a storyline project that worked in rise, but nothing it does not want to wooooork. 

help.. :)