Hi Bosibunch - welcome to the forum!
You may have to first provide some more information, e.g. in which app are these files located? And, depending on that app, have you checked the app's options or the app settings to see if that is even a possibility? Bottom line - more information, please.
I have files in Notes to protect at this moment.. Thanks!
Well I have a list of passwords in a file I don't want to leave open own my iPhone & iPad. Restrictions didn't seem to protect Notes in settings.