Translation in case developers cannot read the OP: Files in certain languages such as Japanese, Chinese and Arabic may be written from right to left, which is supported on PC but not on iOS. Since most Japanese books and mangas are organized vertically and from the right, it is of great impotence that the iOS version support such format, so more users may start using Acrobat on iOS instead of other PDF apps.
Translation in case developers cannot read the OP: Files in certain languages such as Japanese, Chinese and Arabic may be written from right to left, which is supported on PC but not on iOS. Since most Japanese books and mangas are organized vertically and from the right, it is of great impotence that the iOS version support such format, so more users may start using Acrobat on iOS instead of other PDF apps.