iPad “File could not be downloaded”

Hi there! I’ve been trying to download PDFs on my iPad (both through Chrome and Safari) but each time I click the “Open In” button I get an error message that the file could not be downloaded. It’s worked for me only once in the whole time I’ve been using this. I’ve also read in other forums that this is a problem for others as well, but there seems to be no solution as of yet. Am I missing anything? Can someone offer some pointers? It’s been driving me nuts.