Sorry for asking the obvious, but are you 100% that the filename did not change in the handoff? Assuming the names match up, I don't know why Premiere isn't seeing it the file. But, if you're confident that you know exactly which file you need to relink - uncheck "Display exact matches only" near the search box, select your file, and relink.
It is the same (It was my file I uploaded for him to use). It is also odd, because I cannot dive into sub folders in teh client location on my hard drive - it only shows the root. Had this happen a few times lately with both 2023 and 2024 versions