It allows to store attachments on Google Cloud Storage.
To use Google Cloud Storage, the trytond configuration must be modify to set in the database section, the class to tryton_filestorage_gs.FileStoreGS and the bucket to the name of your bucket. Here is an example the section:
[database] class = tryton_filestorage_gs.FileStoreGS bucket = bucket-id-here
The authentication must be set using environment variable as explained in the Authentication section.