http status 404 after trying to export to .mp4

Hello,
I have this issue.
I have recorded dvr data from one nimble and have to move the records to another(again in dvr type)
I copied the directory with 'timestamp name' and all files in it on another nimble. REstart the second nimble, having the same setup for this stream.
After that I can access the copied timeline with playlist_dvr_range m3u8 link, but cannot export this timeline to .mp4 file with api method: 'manage/dvr/export_mp4 ....'
It says '404 not found'. It seems like the nimble server doesn't see this timeline for export.
Am i missing something or is it possible at all such moving of dvr recorded files from one to another nimble server?

P.S. I can use ffmpeg to record playlist_dvr_range to mp4, but our stup is different and is not suitable.
Thank you

Hello, Krasimir.

To help you we need more sensitive information about your setup. Please open a ticket at wmspanel.com/help
Please attach the exact DVR stream URL you're exporting and the export command.

Thank you.