Currently, when you create a new item using a SharePoint list customized form, PowerApps does not support list folders. Meaning, it is always created at the root level of the list regardless of the folder you are in when you create it.
To avoid the 5000 limit of items in lists, when often use folders. But if PowerApps cannot place newly created items in folders... well it's useless.
So, if you could please provide PowerApps with the support of folders, it'd be great.
Assuming that document libaries are the target for folders here, and not lists (since SharePoint Lists do not support folders), the work is started. I don't have an estimated release date yet, but will keep updating this item as the work progresses.