For user generated storage the location is determined by the country code against the user.
UGC created using Creative Cloud for enterprise can be stored in the US (US-East VA), Europe (EMEA-West IE), or Japan (APAC-West JP) regions. An end-user’s regional data store is determined when the user is created in the Adobe Admin Console and remains consistent throughout the user’s lifetime. In other words, content created by a user account in the US will always be stored in the US data center, regardless of where the user is located when they upload the content.
https://www.adobe.com/content/dam/cc/en/security/pdfs/CCE_security_whitepaper.pdf