"FBX Batch Export Add-on with Rotation (https://www.katsbits.com/codex/fbx-batch-export-rotation/)" https://www.katsbits.com/codex/fbx-batch-export-rotation/ an Add-on for batch exporting (static/non-animated) mesh objects in a Collection to FBX with axes of orientation data (including a fix for Unity's aggressive rotation filter for Blender exported files).
Minor update to the FBX Batcher + Rotation add-on, script needed a few tweaks to the UI and rotation values. Should be fixed now.
Installation- Remove previous install and shut down Blender.
- (Re)open Blender and install the FBX Export Add-on
- Restart Blender
A bit fiddly but this ensures Blender clears the *.py script and Add-on repository (cache), forcing it to use the latest install instead of pulling in the cached version.