Why my video is not saved?

Poor free storage? What error message are you getting?

Perhaps I can't understand your question correctly. Be patient.

You said: "I recorded video but not saved in my phone it’s showing error".

My first question: What kind of video ar you talking about? a video recorded using your iPhone's camera or a screen recording?

My 2nd question: What do you mean when you say: "Unable to load Video, an error occurred while loading higher-quality version of this video".

What higher quality are you referring to?