For cameras, like the Autel X-Star Premium's, which capture DNG and JPEG files simultaneously, but the DNG files have incomplete metadata.
Datadata is a simple tool which scans a directory, and all of its subdirectories, for pairs of DNG and JPEG files (photopairs). For each pair, Datadata will copy the EXIF metadata from the JPG to the DNG.
* Note: please test this only on files you've backed up, just in case. This app is largely untested, and may eat your files, burn your home, and destroy your crops. You've been warned!
A Mac OSX version is now available for testing.
A Windows version is coming soon.