Do not place the save files in a sub-folder; they must be in the root of the ID folder for the emulator to recognize them. Transferring Data from a Nintendo Switch

The most straightforward method to find where the emulator stores your progress is through the interface itself:

A specialized save-state management system designed exclusively for Super Smash Bros. Ultimate on Yuzu. Unlike standard save states which act as single "snapshots," Timeline Scramble allows players to create a chain of time-stamped events within a single replay or match, and hot-swap between them instantly without reloading the game.

: Open Yuzu, right-click on Super Smash Bros. Ultimate in your game list, and select "Open Save Data Location" .