hopemitchell33 Some more information would be helpful, otherwise we're all guessing.
What does "uploading multitracks" mean? That language doesn't mean anything specific in ST.
Please walk us through, in detail, what you are doing, and step by step, how you are doing it.
When it comes to the audio files, ensure you clearly explain how they were created/sourced (exported from DAW? downloaded from a stems website? sitting in Apple Music?) and what you are doing with them.