Question:

I cannot rename the image file on Gallery

Answer:  

Samsung is aware of the symptom and Samsung is scheduled to release an improved Gallery app version soon to resolve this.

Therefore, please check for updates to your installed application regularly via the FOTA and update the Gallery to the latest version.

To ensure the best experience, Samsung encourages all users to keep software and applications up to date at all times.

Alternatively you can also rename the file name of image within Gallery on My Files.

- On My Files, tap Images > Select target image > Tap and hold it > Tap More > Rename