Hello, a relative path is never saved inside the Spine editor. As soon as you unfocus the output path it will display the absolute path where it will be exported.
If you want to make sure a relative file is kept, you can save your export settings and edit the json, but you would have to load it and make sure to never focus the output field.
Likely the best way to do this is to export through CLI writing a script instead.

I want to add one more suggestion about export.

There is another issue. For any new project, when try to export the 1st time, it use last project's export path which is almost always undesired and far away from the current project directory. Default to local project folder (./) would be much better. At least it won't export to other project's output directory by accident and I believe most user generally just want to export somewhere under the project folder. e.g. ./export, ./videos or ./output. The step to browse back to the project folder can be avoided if not default to last used path.

Thanks

I think this is a really simple thing, but very useful feature if that was realized.
I work with multiple colleagues, and the export path of .spine project they sent me is changed every time :tear:
Although it is not so big thing, it is a bit bothered.

Please consider that.