The main function of money is to store value or to be used for payment?

There is a lot of debate on this issue.
I still tend to agree with that Austrian School writer's view.
Storing value is the most important, while payment is secondary.
A currency that no one is willing to hold for the long term actually has its overall value greatly diminished.
The first thing about money is to solve the problem of whether everyone is willing to hold it long-term.
Everyone is willing to hold gold for the long term, but not copper coins, so copper coins are not high-quality money.
Everyone is willing to hold Bitcoin for the long term, but not stablecoins, so stablecoins converted from fiat currency are also not high-quality money.