I have been used to drag every single video file into mp3tag and used it also to find my broken video files, but now it seams i cant do this anymore it wont allow me to drag broken or is it just because i moved to win11 ?
Could you explain a little more?
Which MP3tag version do you use?
If you suspect W11 to be the cause - how did you move to Win11?
Do you get error messages?
Where are the files stored? Locally? On a NAS?
Would screenshots illustrate the problem?
I am trying to drag 1200 videos into mp3tag without luck. it is from a normal pc hardisk. I am using the latest version 3.27A
I am alo trying to move a single file but it wont accept it, i am than trying to play the video but VLC shows error.
It was possible to drag error videos into mp3tag on earlier versions, i dont remember the versions now. That was mpstag would show a error sign so it was easy for me to see what video was broken.
Another thing if i add a single video now and than add a single video more it will take out the first video of the list. That means i have to add all at ones and cant take them one by one. 
hope this makes it more clear what i mean. and it seams now it is not win11
If you can drag&drop single files, then that would mean that the function itself still works.
You would have to check the files as
whether the files are MP4 files at all.
You can add further files with d&d if you hold down the Ctrl key.while dragging&dropping.
Like that you may find out which file is the problematic one.
and as it works for some files, it also does not seem to be an MP3tag issue.