A Microsoft file hosting and synchronization service.
this is exactly my issue. Started Saturday morning. Cant access any of my OneDrive files but I can see the most recently opened from the list. Its incredibly frustrating. I have year of photos and documents that are important. Was on the phone with a nice person from MS tech support today but they couldn't help me and said I had to create a ticket for a OneDrive account rep to contact me. No idea when that will be or IF someone will reach out to me.
I can log into OneDrive on my laptop using my employers MS account and see my work files. Its my personal account that has somehow disappeared. I can dig into my hard drive and see the files and photos in OneDrive but they are all locked and I cant open any of them.