kio-onedrive, now version 0.0.8, supports (experimentally) Sharepoint drives. kio-onedrive is a project of mine that allows users to access files stored online in Microsoft’s OneDrive and Sharepoint cloud file storage services as if they were local files on KDE applications and many 3rd party apps.
To access a sharepoint drive, install kio-onedrive and configure a Microsoft account as described on the README, then type sharepoint:/ on Dolphin’s (the file manager) address bar and hit enter. You should see a folder with your account name, and under it, your Sharepoint drives.
I don’t have a Microsoft corporate account so any feedback or bug reports is appreciated at the issue tracker.