With folders in a list then we can break permissions in a folder instead of each item, and then grant access to a specific subset of list items in a SharePoint list.
When we create Power Automate flows based on SharePoint list item created or modified events (‘When an item is created’/’When an item is modified’), the Flow will be triggered by modifications/creation of items and also folders.
Find the solution on this blog:
When you build a flow in Power Automate, it’s connected to the whole library. It doesn’t care what file users add or modify, it’ll process all the files in the same way. But sometimes you don’t want to process every file.
The “When a file is created (properties only)” trigger is an excellent way to control files by automating the actions that deal with them.