Hello [mention:9d514de4dbb3411f90d51a7a5e577b5f:e9ed411860ed4f2ba0265705b8793d05] this is possible, but quite hidden - you need to check the box "Include subfolders" in Files view in the left-hand pane - this will give you all files from all folders and you should be able to open them all as one file.
Can you check this if it works for you?
Thanks, Daniel