Can not uncompress files after using app – iSaveit Review

I downloaded a .rar file and can not open the files to extract file and because I can not find any unzipping app that can locate my download .rar file. I have try 15 unzipping apps and 5 file managers with no luck. This app creates its own limbo to store downloaded files that no app can locate. I D/L 6gb of files that I can not uncompress these files. Creater incorporate unzipping option to this app or isn’t useless
Review by heavenlygiants on iSaveit.