This app rename Photo/Movie file name automatically. Renamed file name format : Photo : [prefix]YYYYMMDD_hhmmss_nnn[postfix].jpg [prefix][arbitrary string][postfix].jpg Movie : [prefix]YYYYMMDD_hhmmss_nnn[postfix].mp4 [prefix][arbitrary string][postfix].mp4 Very Simple and Easy!! The rename of SD card files can be done. Time Stamp can be gotten from file system or EXIF file. (When EXIF time stamp is selected, but If EXIF timestamp is not available, file system time stamp is used.) Supported file extemsions are : JPG, JPEG, JPE, PNG, GIF, TIFF, TIF, BMP, AVI, MP4, M4A, MOV, QT, MPEG, MPG, WMV. [Caution] Don' forget make backup all PHOTO and MOVIE files on 1st use. [Known problems] - The filename of "Image","Video" and "Recent" in "Files" app is not changed if data is stored in internal storage in Android 8. [Online Manual] https://uchida001tmhr.jimdofree.com/manual/pm-rename/