I guess I’m stupid or blind but I cannot activate any synchronisation for files to the cloud on my phone.
I have 8 options to activate for the cloud like contacts, Pictures and so on, but nothing like file/documents.
If I remember correctly, the syncing of the Documents directory is included with “Pictures and videos”.
Sometimes things will sync okay, sometimes it will take forever and a day.
Going with the above suggestion is the best bet.
Are you a missing “share with cloud” option? I used the workaround of a “share to sdcard” miniapp that lets me save to the Documents folder and from there on…