Adobe Acrobat Reader for IOS (running on iPad Pro) is unable to open certain files (in my case it is all the files sent by the South African Revenue Services, the receiver of revenue of the Republic of South Africa), yet Adobe Acrobat Reader for Microsoft Windows on my laptop opens them without a problem, even some email attachment files that the Reader for IOS says are corrupted. When openining such a file, a blank page with an error message comes up, and advises user to use “Adobe Acrobat Reader DC for MAC or Windows” to open the file (which is not available on the App Store for my iPad Pro in any case). The updates of the App have not addressed this problem over the years, to date. What could be the cause of the problem? What should I do to resolve it? Attached is a sample of the file to illustrate the point, and a screen grab of the error message. I request that Adobe sorts this bug out to ensure that the reader can open any acrobat format file that it is able to open on other platforms.