How to upload a Video in back4app - flutter

so I‘m working with flutter and Back4App and I want to Upload Videos from the Gallery or from the Camera to Back4App. I couldn‘t find a tutorial to it online so I‘m kinda stuck. And help is much appreciated!
Also I can already choose videos from the Gallery or take Videos with the camera but after that my App crashes and the Video wont show in my app.

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https://github.com/eternalstorms/ESSVideoShare-for-OS-X-Lion

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