[skitti]

To start the slideshow at startup, you need to run the following instruction:
SlideShow(plugin://plugin.onedrive/?action=open_folder&driveid=<REPLACE_FOR_DRIVEID>&item_id=<REPLACE_FOR_ITEMID>&content_type=image&child_count=0)

Just replace the DRIVEID and the ITEMID values with the correspondent values of your folder.
If you don't know them, just go to onedrive.com and navigate to your folder. Once there, the url will have 2 parameters: id and cid. The id is your ITEMID, cid is your DRIVEID.
Let me know if this works for you. 

I cannot find CID and ID in the URL on OneDrive. I have OneDrive for Business, can it be the reason?
I want to Autostart the slideshow from a specific folder on Onedrive.