The variable pegacloudcustomerroot is for internal use only and cannot be modified.
To help customers with file storage Pega provides Pega Cloud File Storage. For each environment it provides cloud file storage that is pre-configured, secure and isolated. This storage is intentionally isolated per environment in order to prevent interference across environments (e.g., dev systems cannot corrupt or access production).
With Pega 7.4 the concept of repositories was added so you can easily access Pega Cloud File Storage and a variety of 3rd party file stores (e.g., private AWS S3 bucket, Sharepoint, Box.com). The pegacloudfilestorage repository is pre-configured by default. You can easily add repositories for 3rd party file stores.
We currently do not allow multiple environments to access the same folder in Pega Cloud File Storage (for data security reasons). However, you can configure a repository in two environments that points to the same 3rd party file store (e.g., private AWS S3 bucket, Sharepoint or Box.com). This will allow you to share files/folder between environments.