Ipad Adobe Acrobat Crashing

Hello. My app suddenly won't save the annotated PDFs anymore. Any attempt to save an annotated file ends either in the app crashing or the file being converted to a "recovered" file then crashing. Please help. All my med-school work is in the app and has been carefully organized for almost a year. I don't want to lose it or move all to another app. HUHU. Hoping for your quick reply!