Two other ways of selecting multiple files: tap once on the first file you want to select, then pop up the keyboard and:
- for individual files scattered through the list, tap the Ctrl key, then scroll through the file list and tap the other files you want to select; or
- for a block of files, tap the Shift key, then tap the last file to select; everything from the first to the last will be selected for you.
Works just as with desktop Windows.
-Bill