Select the Remix icon at the top (it’s located next to the Save option). In the window that opens, you can now add your own take, with the same tools that you would use to create a new Reel.
To save a Reel on Facebook, tap on the three-dot menu ... open the Reel and tap on the bookmark icon again. This will remove the Reel from your saved list. Can I download a Reel from Facebook?
Since Instagram does not provide a direct download option with music, one of the easiest ways to save Stories with music is ...
Instagram’s Built-in Download Option for Reels: If the content creator has enabled downloading, users can save videos ...