A Microsoft file hosting and synchronization service.
I tested a few search queries and obtained the same results on web (PC) and on mobile (iOS and Android).
So it's definitely a server/cloud switch somewhere. I guess they are fixing it in waves because every now and then someone tells us that the search function came back after being missing for some months.
I just wish they had treated this issue properly. We should have been informed appropriately.
Unfortunately, I need to update this post.
After noticing that the search function had returned, I decided to upload all my work files to OneDrive again.
Imagine my surprise when those new files weren’t showing up in the search -- neither by file name nor, of course, by file content. Only two things could have happened.
First, OneDrive takes an absurd amount of time to index uploaded files.
Or second, the function that used to work simply decided to stop working for me.
That’s it, folks. I'm still without a basic feature in an online storage system.