@LauraPierson I took a look at your recording, and attempted to replicate it on my end. I wasn’t running into the same issue.
I was able to copy + paste to replace using both keyboard shortcuts and right-click menu as expected. If you clear your cache/cookies for just Figma, does that seem to help?
If you are able to, can you try copy + pasting to replace on our desktop app? Would be good to know if this is replicating across different places.