In my rtmedia gallery, after the uploads, I have the thumbnail icons :
but when it is uploading the thumbnail icon is not showing :
Yes I tried to wait, I refreshed and I even retranscoded all my videos, but there is still a problem, videos are still completely grey.
And when I upload a .MOV video for example, i can see in the transcoder settings that the transcoding usage in Mb increases, so it processes. And in the video lightbox, when I look in the inspector console, I can see that the video is well of type mp4.