Here’s a short ILM video that serves as a prequel to Rogue One… both the cinematic version and the original, pre-reshoot version(s) of the film.
The short shows Rebel ships transmitting information about the Death Star to Alliance Headquarters. At the very end, just before being blown up, one of the Rebel pilots tries desperately to confirm whether the data was received.
In the final cut of Rogue One, it didn’t get through: the Alliance doesn’t know about the Death Star until Jyn Erso learns about it. But in earlier Rogue One edits, it evidently did get through – trailers show Mon Mothma briefing Jyn about the Death Star, rather than the other way around.
Like the film itself, this short prequel to Rogue One is deliberately designed to be compatible with multiple Star Wars canons.
The trouble is, most of those alternate canons (including varying edits of Rogue One) are currently locked away in the Disney/Lucasfilm vaults.