Thanks for your help! It doesnt seem to work in 50p but I managed to get it to work in 50i. I didnt manage to import any Video files into Wave Agent. My files now are xavc-s 25p UHD from a Sony a7 III.
But I have another big problem. The Mixpre 10 II has a file size limit of 4GB because of the SD card recording. So it always splits audio after some time and creates a new file. in 32bit with 10 tracks 48khz its about 37 minutes. So its very likely to have a video file that has to be synced to multiple audio files, but that doesnt seem to work. Avid and Resolve only sync to the first audio file and ignore the next file. Is there any workaround for that?