You didn't say what version of Premiere Elements you are using. Nor did you say what what you have for video settings in your Pixel. Older versions of Premiere Elements can't work with newer footage from phones.
Bill and John are both essentially asking the same things.
You can get us the answers we need in order to help you by opening your Pixel video in the free download MediaInfo. In MediaInfo, set View to Text and then copy the text of this report and paste it to this forum.
Without these details specs for your file we won't be able to give you any specific advice.