Chromecast problem not showing pictures

[rjwaringa 0]

I'm searching for a replacement of my Kodi mediacenter and now I'm testing Emby and Plex. With Emby I ran into an issue when only streaming pictures to my Chromecast
from several mobile IOS devices ( ipad and iphone ). Streaming videos is not a problem. If I cast from a Windows machine using chrome browser then there are no problems so I think it's not my gen1 Chromecast.

Details:
Emby server 4.5.4.0 on Ubuntu 20.04 LTS
With plex IOS app no problems to cast pictures
Emby connects to chromecast, videos no problem
In casting mode. When clicking on a picture in IOS app nothing happens.
Not in casting mode in IOS app then I can click on picture and showing on mobile device.
Casting from windows machine no problems.
Gen1 chromecast firmware 1.36.159268

Can someone help me. 

Edited April 25, 2021 by rjwaringa

[rjwaringa 0]

Same problem when casting from Android smartphone. 
 

Casting directly to Samsung tv using DLNA works for video and images but images are small. There has to be a problem with the emby app on iOS and using chromecast.

I attached the embyserver.txt

embyserver.txt

Edited April 27, 2021 by rjwaringa

[Luke 37066]

HI, we're looking into this. Thanks for reporting.