About one third of my pdf files stored on my iPad cannot be opened by Acrobat. Or, I should say, the files 'pretend' to open, but display only blank pages. Acrobat displays the correct number of pages, but all pages are blank. The bug is generally independent of file size, but somewhat more common with large files. There is not issue with memory on my iPad as there is over 200GB of space available. The but is also independent of where the file is 'stored,' whether 'On this iPad,' in iPad Files, or in OneDrive. The bug makes Acrobat for iPad virtually useless, and needs to be addressed promptly.