Have an ability within Power Apps to export a gallery directly to Excel, like MS Access.

[TonyAdrian]

Many customers want to be able to export data from a Power App directly to Excel, like we can with Microsoft Access. 

[HISD_JSO]

This is a key missing feature. For now, I have had some success using flow to generate a CSV/Excel of the data in a collection, that can be provided back to PowerApps to be downloaded with the "Download()" function.