I'm curious, what did you select, and how is the UX? With OneDrive, it looks like any other folder in your windows/mac computer, and the built in gallery of the Samsung phones my family uses will transparently sync to OneDrive. Other apps on Android can also "directly" access OneDrive files, but that sadly needs support from the app. And it all is available for access online via browser.

My main goal is to prevent data loss if a device is ever stolen / fails beyond repair. And being able to tell your non-technical family members to "put important documents within this folder" / "log in here if you need access outside your normal devices" is low enough of a barrier so that they actually do it.