Open the OneDrive app on your mobile device.
Select a file or folder - press and hold until the checkmark appears next to it.
Tap the Share icon.
From an Office app:
Open an Office app like Word, Excel, or PowerPoint on your device.
Tap Open, then tap OneDrive - [company name].
Tap the More icon (three dots) next to the file, then select Share.
Direct Link: https://support.office.com/en-us/article/work-on-the-go-with-onedrive-8ce30c76-e27b-4e55-9050-082393954213?ui=en-US&rs=en-US&ad=US