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How did you lose those files? What kind of files were they? Do you know where they were located?I have lost files of my Oneplus 5 with Android 8.
A backup will not include the deleted files (unless it's a full disk image, in which case do you have a way of doing that on a non-rooted phone?).You can take a backup of your device and then root your phone. It would be better.
It might be better to add this thread's question to the other thread. That would give everyone a clear picture of what you're dealing with, and make it easier to respond with something helpful.@MoodyBlues
Have described in a previous thread already. Basically after coming photos over with windows - I deleted 'somehow' all media containing folders in the internal storage. and thats including hidden ones like .ota or .mcs