Video in nostr is a f*ckn mess right now. We have several server implementations that are not working properly or have size restrictions. Uploading errors are not handled or not explained to a user. We have  specific video notes (that flare.pub/zap.stream use) which are not supported by the social apps. 

Your best bet right now is to get the creator plan from nostr.build and upload there. 
I’m currently working on an app to upload and manage your media on nostr and hope I can improve things a bit but it’s not something one app can solve alone. 

 I wish we could link directly to IPFS, with nodes acting as hosts for popular files and helping people find other files on the IPFS network.  That would work with video files very well, I think. 

 You could link to cloudflare‘s IPFS gateway already. The issue with video is that no one can run a CDN with that kind of bandwidth for free. 
Almost all video players need an HTTPs server somewhere. 

 Thank you, for explaining. It's good to know the current state of it all. Looking forward to further progress and also thank you for your contribution! 🙏🤗 I will get the nostr.band 

 Meant to say nostr.build