How to sync Downloads folder to iCloud?

I need to sync the Downloads folder to iCloud and then all the downloads should automatically sync with iCloud.

I tried to:

1. Create a new Downloads folder in the terminal of MacBook in the Documents directory.
2. Tried to move the default Download folder to the newly created folder.

When I tried to use the mv command to move the default Downloads folder to the newly created Downloads folder in Documents in the terminal, it gives permission denied error.

I am trying to achieve what was suggested by user PhillipHolmes in the below thread, please. Thank you:

How to sync an additional folder to iCloud Drive similar to how macOS Sierra does it?

Thank you

Set your Download location as Desktop or Documents in Safari Preferences → General

Then turn on iCloud for Documents and Desktop in System Preferences → iCloud → iCloud Drive Options.

You might need to move existing content in your new download location somewhere else.

For your later edit, just set the Download location in Safari Preferences → General as Documents/downloads_folder_you_made and the turn on the sync. You might need to move the existing content in the default Downloads folder to the newly made one.