Bumped into what I think is a unique app, Photo Renamer – PhotoGadget.
Price: $0. Tolerable ads, at least during my maiden 20 minute usage. Does NOT futz EXIF! Slight bug: insists on applying the current date as the first part of the filename, even after selecting “shooting time.”
Pics tell the story.
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Be sure to add a dash ( – ) before your file name. Otherwise, it bumps directly into the date.
Happy Holiday season wishes! 🎉 😀 🎉