I need a better app to store pdf files on my ipads, and to view them in-flight. The pdf files are my POH, avionics manuals, airplane logbooks, and miscellaneous such as a list of service centers. Required: 1. the files must be stored locally on the ipad. 2. a search feature, to find a key word in a pdf file. 3. no monthly subscription costs. Desirable: 1. synching between my two ipads. 2. an app I can dedicate to aviation. 3. small size for storage. Foreflight is not attractive for this purpose -- although it can store and view various pdf files, Forefight has the crucial problem that my files are lost if I must delete the app and reinstall. Foreflight backs up some files to the cloud, but only files that are from Foreflight or FAA; not my POH etc. I already lost all my pdfs due to this problem. Evernote is no good either. I discovered, after moving all my files to this app, that it stores some documents in the cloud only, so that I cannot view them while in flight. While on the ground I am unable to determine which documents are stored locally vs in the cloud. Moreover, it is bloated with features I don't need, and Evernote now expects me to pay monthly. Any suggestions?