Yep, cloud file sync is the go-to in this scenario. Take your pick: Google Drive, OneDrive, iCloud, DropBox, etc. All the device manufacturers have their own solution as well as the original third-party ones.
The choice you make is probably best made by centering around your mobile device platform, i.e:
- Android - Google Drive
- iOS - iCloud
If you use a real mix of devices from different manufacturers (like me) then maybe think about choosing based on what device you produce/consume the most files on, i.e. if you’re doing most of your work on a Windows device then maybe OneDrive is best, or iCloud for macOS.
If you’re super paranoid about giving up your files to some big corp then you can also run your own private cloud file sync solution, i.e. Synology who make arguably the best/most-popular NAS units have their own cloud sync apps. Then you get to keep total control over your files (I do this for all my super big files and use it as a backup for a lot of my photos which are synced to the Adobe cloud). Probably not suitable for norms though