I have been using the tool to migrate data in shared folders on our local file server in to Microsoft Teams document libraries on Sharepoint Online:
1. Its not always easy to know the URL of the relevant Teams library (I used Powershell Get-SPOSite to obtain all the URLs) and I still havent worked out the correct URL for the general channel documents library (so everything ends up in the shared library and I move things afterwards - not very efficient!)
2. I'm logging in to the tool with my own account (Office 365 global admin) but must be an owner of the Team to access the document library with the tool (there must be another way i.e. add an admin account as owner of all the Teams?)
3. Once migrated only owners of the Team can access the files (why do the standard Team member edit permissions not apply?). How do I migrate the files so that they just receive the standard MIcrosoft Teams permissions of the document library? How do I change the permissions for those folders I have now migrated, instead of making everyone an owner like I do now as a workaround.