Opening a revision of a damaged file

I was using creative cloud to store pdfs so I could access them on both my iPad and computer. I was able to highlight and at sticky notes and it would sync, etc. I tried to open one file last night and my iPad said it was corrupted/damaged and wouldn't open it. I go online to creative cloud to try to access previous "revisions" and it won't let me open the revisions versions of the pdf. Does anyone know how I can open the revisions?