Criminal defendants do not have the right to file an appeal simply because they disagree with the verdict they received. You may only challenge a criminal conviction on procedural grounds.
There are four valid grounds for appeal that your Omaha attorney can argue in a case. The most common is an error during the trial that constituted a violation of your rights. Alternatively, you may base your appeal on allegations that a judge abused their authority to make an arbitrary decision with no basis in the facts of the case.