Hi
@pk101Whilst Stream offers a migration path from Office 365 video, AFAIK it doesn't offer migration capability from third party platforms and as said here
https://techcommunity.microsoft.com/t5/microsoft-stream-forum/video-to-stream-migration/m-p/144489Until Stream API's are developed (which are being developed this year and are on the Microsoft 365 Roadmap), the only way to move video to Stream at this time would be to download it from the source system and upload it into Stream - in other words do it manually. Stream does support a wide range of file types including MP4, WAV, AVI and MXF. For a full list see here
https://docs.microsoft.com/en-us/stream/input-audio-video-formats-codecsAs said, once the API's have been released you can expect migration tools to surface on the market - mostly likely third parties with Microsoft potentially releasing it later. This is all conjecture until the API arrives
Hope that answers your question
Best, Chris