Having to open many PDF files from a folder, and having to process each in file in its filename order, Acrobat does not group / sort the tabs in order. Selecting multiple files, will create the tabs in whatever order the program wants.

The tabs have to be dragged into order manually. This is a constant gripe with the software. A simple button to sort the tabs by file name, ascending or descending, would make life a lot easier and quicker when having to work on hundreds of files a day.