I inadvertently deleted information that I created in SNotes. Is there a way to retrieve these files?
Once you delete something from the Android operating system (messages, notes, pictures), it will be gone. Unless you performed a backup, you will not be able to restore it.
You can use a data recovery tool to recover them.
Have a look at this guide,
recover android files
retrieve deleted text messages android.
You can follow it to recover your photos.