No need for a new thread, the question still falls under the same topic.
If you want to stop files from syncing to iCloud and be able to remove them from iCloud, copy them to a folder under "On My iPad" rather than "iCloud Drive".
The difference between "keep downloaded" vs "download now":
Keep downloaded will strive to keep the file local to the iPad so you can access it while not connected to the internet in some way. This means it will not remove it when it needs space or if it has not been accessed in a while which it tends to do normally.
"download now" means to effectively download the file in that moment if its not already downloaded.
If its already downloaded it will have an "Remove Download" option instead of "Download Now"
The files will still reside in the "iCloud Drive" location, but will be made available for access without an Internet connection in either case.
As mentioned, if you want to move them off of iCloud Drive, copy them to a folder under "On My iPad" and delete the copy in "iCloud Drive" entirely by selecting the "Delete" or Trash can option. This removes it from the iPad's iCloud Drive location and from iCloud completely.