Here are the steps to Migrate file share to SharePoint Online:

Plan your migration: Before you begin, create a migration plan. Decide what data you want to migrate, who will be responsible for the migration, and when the migration will take place. You should also consider any customizations, permissions, or metadata that you want to preserve.

Set up SharePoint Online: Create the SharePoint site or subsite where you will migrate the files to. You can use the SharePoint admin center to create the site or subsite, or you can use Microsoft Teams to create a team site.

Prepare your files: Prepare the files for migration. This may involve cleaning up the file structure, removing unnecessary files, and ensuring that file names are compliant with SharePoint Online naming conventions.

Choose a migration method: Decide how you want to migrate the files. You can use the SharePoint Migration Tool (SMT), a third-party migration tool, or the SharePoint Online PowerShell cmdlets.

Run a test migration: Before you migrate all your files, run a test migration to ensure that everything is working as expected. This will also help you identify any issues that you need to address before the actual migration.

Migrate your files: Once you have completed the test migration and resolved any issues, you can begin the actual migration. This may take some time, depending on the size of your file share.

Verify the migration: After the migration is complete, verify that all the files have been migrated correctly. You should also test the SharePoint site to ensure that everything is working as expected.

Train your users: Once the migration is complete, train your users on how to use SharePoint Online to access and work with their files.

Decommission the file share: Finally, decommission the file share to avoid confusion and ensure that users are accessing the correct location for their files.

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