Bug in pre-installed app leads to excess storage usage
There's a bug in the first-party app Boost Installer, package name com.dish.wireless.installer. It periodically downloads updates over time, but never clears them out. The residual files are places in /storage/emulated/0/android/data/com.dish.wireless.installer/files and over time, this folder can grow into the tens of hundreds of gigabytes. My phone itself had over 80GB of trash installation files. I'm not sure where to reach out to see that this bug gets fixed, but it's best to share instead of just keeping it private.
TL;DR: If you're running low on space, check your phone's files app under Android/Data/com.dish.wireless.installer and delete the folder labeled "files".