I don't find information about "event log" file. I see in Shelly app only some ones, but don't know how much registers are availables, and if it's posible to download this file.
As far as I know, you can see the last 50 events in the eventlog of the app.
Unfortunately the H&T or other sensors where offt are eating up these 50 logs quickly.
Best for the devices where you don't need a log, in the settings under Application Settings -> exclude from event log ,disable. So you can see important logs longer.