Is this coming from Sims4?

ee7154b6c3e70698​  As I said, the files are temp files that the game creates when you have a save loaded and then deletes when you quit.  OneDrive may delete them accordingly even if you choose to keep them because it's simply trying to mirror what's on your computer.

Carizzard​  You might only see the message now because OneDrive is full enough to need to delete some data.  You can check your free and total cloud storage by right-clicking the cloud icon in the lower-right corner of the screen and selecting Settings > Account.