Hello, could you tell me if it’s possible to store MP3 files on the box, similar to what eedomus does? The goal is to achieve the same functionality as my eedomus box, which means that every time a window opens, a door activates, the alarm goes off, or a leak is detected, etc., the flow sends a push notification and plays the corresponding MP3 file on the Sonos speaker. My MP3 files consist of synthesized voices with a background music lasting approximately 15 seconds each, and I have at least 30 of them.
You can store MP3 and WAV files (max. 900 KB per file) with the Soundboard app.
And to play the files on Sonos speaker, you can use this action card:
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And if you have larger MP3 files, you can use the Micro Web Server app, in combination with the FTP client app to retrieve an URL you can also send to Sonos.
or play a favourite via spotify
And if you have any NAS with UPnP, you can use the Universal Media Player to browse, play files and retrieve urls dynamicly 
