The MT5 mobile app does not persistently save custom timeframes like 3-minute or 10-minute unless those timeframes are explicitly supported or pinned.
The standard timeframes that are "safe" and persistent typically include:
-
1m, 5m, 15m, 30m
-
1H, 4H
-
Daily, Weekly, Monthly

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Currently I have the 1 minute, 2minute, 5 minute, 15 minute, 30 minute, 1 hour, 4 hour, and daily timeframe on my MT5 app.
When I add the 3 minute timeframe and I close the app and reopen it, the timeframes for some reason gets reset to 1 min, 5 min, 15 min, 30 min, 1 hour, 4 hour, daily, monthly.
Anyone know how to fix this issue?