To export your file with the ".atlas.txt" extension instead of just ".atlas", you need to adjust the export settings in the Spine Editor. Under the "Export" section, go to "Pack Settings" and ensure that the atlas extension is set to ".atlas.txt". This is particularly important if you are using Unity, as it requires the ".atlas.txt" extension for the runtime. If you are still encountering issues, double-check that the settings are correctly applied before exporting.
