On Advanced Custom Fields' Privacy Page you can request and collect all the privacy and GDPR related information that Advanced Custom Fields is providing.
The privacy policy by is a legal document or statement that discloses how Advanced Custom Fields gathers, uses, discloses, and manges their customers' data.
The basis for Advanced Custom Fields sharing, adding, uploading, hosting, accessing or sending personal data out of Europe. Vendors can also add a description of their own impact assessment for data transfers.
Subprocessors are companies that provide a service for Advanced Custom Fields and who has or potentially will get access to personal data of their customers.