I am trying to combine 3 PDF files but keep getting conversion failure errors. I am trying to combine 3 PDF files but keep getting conversion failure errors. I have tried selecting all files to be combined together and I have tried selecting 1 and then adding the other 2. I have completed this operation on a number of occasions in the past, using Internet Explorer, without difficulty. However, I have tried following the advice on the forum and cleared the cache on my browser. I have also installed Google Chrome and Firefox and tried using https://cloud.acrobat.com/combinepdf. None of it has made any difference.These are not large files (453 kb or below) but occasionally the smallest file (174 KB) will load successfully. It takes several minutes for each file to upload whether it works or fails, so I wonder if the operation is timing out.The facility to combine files is the only reason I purchased this application, so it is very frustrating that it has stopped working. Can you help?