Chromecast not playing uploaded MP3s on Deezer

@americanjeff 

Hi,

i‘m not sure if it‘s a legal restriction or a technical one preventing to cast uploaded mp3s. 
First i also thougt it‘s a problem of licences and the reason because casting uploads on other services is possible, because they have a matching function for uploads, so that in the end it‘s not an uploaded file but a matched original server file that is used for casting. And for this file there is a licence. Apple and Google are using such an upload matching and as far as i know Deezer does not use matching. 
But i testet on Googles YouTube Music with some personal uploaded files of mine that are not available on Googles catalogue. These files can‘t be found by matching and have been physicaly uploaded. So Google has no licences for these songs if they are‘t in their catalogue. 
But also these files can be played by casting without any problem. 
This as a fact imho it only can be a technical Problem and not a legal one.