Sharepoint is one of the worst, most bug-ridden softwares I've worked with.
It has a bug with Solidworks (3D design suite) that sporadically makes files completely un-openable unless you go in and change some metadata. They are aware of this, doesn't seem to be any limitation preventing them from fixing it, and it has sat unfixed for years.
Microsoft's cloud storage as a whole is an insane tangle where you never know where you'll find something you're looking for or whether it will work. Some things work only in browser, some only in the app, zero enumeration of these things anywhere.
Completely unsurprised and I'm sure there are many more vulnerabilities ripe for the picking.
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