A Microsoft file hosting and synchronization service.
Yes, and even the likes app on iPad. BUT, the OneDrive app, for ne, is the only place you can set "keep file offline".
I origibalky wanted to actually sync the folder like on PC but quickly realized the $3000 iPad Pro M4 is simply a glorified tablet. The iOS is nowhere near as robust as MasOS or Windows, it's simply a VERY expensive toy.
I've always been a Windows user and ONLY purchased the iPad for digital music purposes.
Good luck!