See this video for learning how the tool works.
Register the code with Cloud Functions the following command. You need to create the bucket beforehand as a workspace for pdf2audiobook.
gcloud functions deploy p2a_gcs_trigger --runtime python37 --trigger-bucket <bucket> --memory=2048MB --timeout=540
Annotation mode usage: to use pdf2audiobook for generating annotation data, set ANNOTATION_MODE = True
and re-register the code with Cloud Funtions, so the tool will generate CSV files for annotation instead of mp3 files.
Annotation tool: use /apps-script code for running the annotation tool with Google Apps Script