How to check the storage is used?
Noted stores your notes on both the device and in your iCloud if sync is enabled.
iOS
To check your phone storage, Go to Settings > General > Manage Storage > Noted
To check your iCloud storage, Go to Settings > [your name] > iCloud > Manage Storage > Noted
To see the file size of individual recordings, Go to the Note menu 
icon at the top right of the editor> “More” icon 
at the bottom left> scroll down to “Audio File Size”.
macOS
Go to Apple menu > System Preferences > Apple ID > iCloud -> Manage (under iCloud Storage)
To see the file size of individual recordings, Go to the Note menu icon at the top right of the editor> the Info tab.