By selling foreign currency, the central bank increases its supply while withdrawing national currency from circulation. Buying has the opposite effect. The tool is used both to smooth sharp exchange rate fluctuations and to manage the money supply in the economy.
It is important to distinguish between objectives. Under a floating exchange rate regime, interventions are typically aimed not at maintaining a specific level, but at eliminating excessive volatility and neutralizing the impact of fiscal operations on the money supply.
The Central Bank of Uzbekistan publishes information about its operations in the domestic foreign exchange market. For a private investor, this data provides context rather than signals: interventions explain why the exchange rate behaved in a particular way, but do not allow predicting its future dynamics. Basing savings decisions on attempts to anticipate regulatory actions is not advisable.