Estus (Dark Souls 3)

The blacksmith in the Fire Temple has an option, he increases the number of flasks.

Ivan Bystrov,
I need to upgrade them so that they replenish more, I saw a flask in many and next to + 3 + 6 + 7, etc.

KingBaby
does this through a bonfire in the temple. but if you have estus fragments, then you will not improve, but increase their number = at the blacksmith

AleXStein
and these same fragments must be looked for somewhere in the locations, right?

KingBaby,
yes, just like the rest of the loot.