Since I was pretty sure there was at least one by now, I did a quick Google search for films titled “Flashback,” and found there have been at least three. All of them did mediocre at best, but then none of them actually seemed to deal with time travel either, so…
There was also a Star Trek Voyager episode titled “Flashback,” but for a show that had a reputation for time travel stories, that one technically didn’t feature actual time travel, and instead used the term mostly true to it’s literary technique definition T-Rex gives.
And there is admittedly some truth to that, yes. ;)