If OneDrive is showing as offline on all of your devices, it is possible the authentication token has expired.

You can use the Mylio Console to initiate a reauthorization with OneDrive and get a new access token. In Mylio, select Help in the menu bar, then select Advanced > Console. In the Console, type the following command and press Enter:

devices

This will output a list of the devices on your Mylio account and an identification number for each device. Note the Device ID for Onedrive, then run the command below (replace ##### with your OneDrive Device ID):

reauth ######

You will be shown a window asking you to sign in to OneDrive again. After entering your credentials, OneDrive should showas Online/Connected in Mylio.