Remixing photos is not available to everyone at this time.
Remix lets anyone create a reel that includes someone else's video or photo. They can also download the video or photo as part of their remix.
To remix a reel
To remix a feed video

Instagram app for Android and iPhone:
To remix a photo
When you share a remix, it’ll show your Instagram username and Remix with [original creator’s username] at the bottom. Anyone on Instagram can tap Remix with [original creator’s username] to watch the original video and create their own remix.
Note that you can
mix the audio and
add voiceovers to your remix. You can also add stickers and text to the original video and the new reel you record. You can remix your own reel, but you can’t remix a video that’s already a remix or videos that the creator doesn’t allow remixes on. Learn more about managing your
reels remix settings.