Is it possible to rename OTL files after you've pressed “create digitial asset”?
I made a typo and found this out later in Unity, but I dont know where I can change this.. ops:

Windows/Operator Type Manager

find your OTL, Right-click your asset name/Duplicate…
correct your name, Accept, it will create copy of your asset with different name
Right-click original asset name/Delete

just be careful if you are using the old asset in any scene, because deleting it will cause your scenes not finding it, so you either need to replace it with new type in your scenes, or just specify different otl file for your new asset, but I guess this is not your case

Thanks, a bit strange workaround but it works!