1. Microsoft Learn, Power Apps documentation. "Import data (all record types)". This document explicitly states, "You can import data into tables in Microsoft Dataverse from files like Excel or comma-separated values (CSV)." It then details the process for using the "Import from Excel" command.
2. Microsoft Learn, PL-600 Learning Path. "Module: Perform solution and data migration". In the unit "Import and export data in Microsoft Dataverse," the documentation describes the "Import from Excel" and "Import from CSV" options as primary methods for bringing data into the platform from flat files.
3. Microsoft Learn, Power Apps documentation. "Export data to an Excel static worksheet". This document clarifies the purpose of static worksheets, stating, "When you export data to an Excel static worksheet, you create a copy of the data... The data in the static worksheet won't change if you change data in the app." This confirms it is not an import mechanism.