Why won't my attorney court-appointed get me an expert witness the review video authenticity and to verify informant if she's an informant the whole police report is a Lie the video authenticity is not how it happened but the video they showed me is altered what do I do
That depends on the state you're in. If you watch the documentary "Gideon's Army", you'll see examples of some of the limitations on court-appointed attorneys. In that documentary, one of the lawyers filed a motion to trick the prosecutor into analyzing fingerprint evidence because the defense attorney had no budget to do that.
Here in Massachusetts, I can file a motion for funds for an expert, and the court will pay the expert.
Since you didn't provide your state, there's really no way anyone can answer your question.