Responsive project upload issue from Captivate to Adobe Learning Manager

I have successfully uploaded 2 of my 3 responsive projects to Learning Manager. the 3rd wont load. it is 13 slides long with audio and some drag and drop. it says customizing content, then the screen just goes grey and does nothing else. In Learning Manager, i get a notification saying uploaded successfully, if i click this, it doesn’t load and it doesn’t show in the content library. any help appreciated please. thanks Bev