Issues uploading thumbnail,. filmstrip and media from rv Flow Production Tracking Submit

Hello,

I submit to shotgrid my maya playblast via Flow Production Tracking Submit to create a version(format, size and codec of the file below):

large_playblast

codecs

and I cannot get any media uploaded - no thumbnail, film strip and and playback even after waiting, even though the feedback is that it’s completed:

For the experiment I tried another file - same codec and format, just lower resolution to lower the size:

smaller file

smaller_file_codec

Maybe the codec is the problem? but why smaller file works?

Thank you