

If the files you received have been processed in any way, this piece of metadata may have been lost. Presumably this is based on some piece of metadata in the files.

I found you don't even have to add the files at the same time for this to work.

Have you tried adding both files to Photos on a Mac? In a quick test I did, Photos (v2.0) seems to recognize that the files belong together and shows them as a single Live Photo.
