downloading

when downloading it is telling me that it is in progress. This is difficult when you have a deadline to full fill. Its seems to corrupt a file after I had to add a transition to the file. then there isn't any audio. so I have to delete the file and re-down load file again. this happened 3 times with the same files. After a few attempts. I am able to download the files without corrupting when adding transitions. I added the transitions at the end and added the last file and now it will not download. Is this because there is a limit on editing time? I've waited almost a day before when this happened with one of my projects. Also, when I open this app it takes me to one of my projects I did months ago. I am not sure if this is the updated version. what do you suggest.