iCloud storage
I want to know if my files will be deleted from my iPhone when I delete them on iCloud
Question marked as
Yes , see the article Delete files in iCloud Drive on iCloud.com - Apple Support
Important: When you delete a file from iCloud Drive on iCloud.com, it’s also deleted from all your devices that have iCloud Drive turned on.
Read Delete a file or recover a file that you deleted from the Files app - Apple Support