We have successfully migrated existing SuiteFile users before. The process will be to export the SuiteFiles into the OneDrive folder, then import them using our Bulk Import. This will validate and import your files ensuring file categorisation is maintained. This is performed in the cloud so no software needs to be installed to run the import. Depending on size, it can take anywhere from 3-12 hours.
Refer to the articles in the section Migration in Administration.