Demo of the Out of Office PowerApp template.
How to Pass Parameters into a PowerApp – SharePoint MMMan
[G]et parameters from outside into a PowerApp, and surprisingly this is really not well documented, but actually really quite easy to do.
MP3 to WAV via ffmpeg.exe in AzureFunctions, for PowerApps and Flow
PowerApps, Flow and Managed Metadata fields–part 1
One (current) issue affecting both PowerApps and Flow is that neither support Managed Metadata Columns properly. This post outlines a method that – after getting access tokens – uses REST endpoints to update managed metadata columns.