We are working on the tail end of a migration from on premise resources (Exchange, File server, etc) to completely "cloud" ie O365. Mail, domain, AD, all has gone very smoothly. File server too ...

You can then decide how you want to proceed. However, file shares are not the only items you may want to migrate to SharePoint. Perhaps you are trying to migrate public folders to SharePoint.

You could create a mapped network drive to the Sharepoint site that you are trying to pull a file from and reference that path in the script. To map a network drive in Sharepoint, select whatever ...