Using the SharePoint Migration tool

To install the current release download, go to: SharePoint Migration Tool

Migrating data files from SharePoint Server document libraries

Start SPMT, and then enter your Microsoft 365 username and password.

Select Start your first migration.

Select SharePoint Server.

Enter the SharePoint Server site URL where your content is located, and then select Next.

Enter your username and password to the SharePoint Server site; username must use the format of someone@example.com. Select Sign in.

Select the document library where your files are located. The dropdown contains all your possible choices.

Enter the URL of the SharePoint site where you want your files migrated.

Select the document library to where your files will be copied.

Select Add. This task is added to the list. If you want to select another set of data files to migrate, select Add a source.

Migrating data files from a local file share

Start SPMT, and then enter your Microsoft 365 username and password.

Select Start your first migration.

Select File Share.

Enter the source path of the file share where your content is located, and then select Next.

Enter the URL of the SharePoint site where you want your files migrated, and then select Next.

Select the document library to where your files will be copied, and then select Next.

This task is added to the list. If you want to select another set of data files to migrate, select Add another source.

When you have finished selecting your sources, select Next.

Review your settings, and then select Migrate.

More info: Tenant to Tenant Migration Office 365 SharePoint | Dropbox to SharePoint Migration

Regards, Bruce