This forum is for reporting errors with the Convert process. If you want to get tips, or better understand the Convert process, then you should look in the Convert Discussion forum.
Please mark any answers that fixed your problems so others can find the solutions.
Here's one I had in the archives, it's from 2022 and loads just fine into the Manual tool. You can save the alignments after making changes to them, and it will still exhibit all the problems we're describing.
Haha I don't believe it, it worked. Here I was thinking underscores are the perfect way to visualize spaces without violating popular naming practices, and it turned out to be my downfall
Good job getting that sorted out quickly, hopefully the end of that problem for so many people.