VariableS3_STORAGE_ACCESSKEY
DescriptionSets the access key for S3 storage

Bucket storage, S3 variant. (For Google variant, replace "S3" with "GCP" in all the following keys). Infinite storage using local disks as cache. See the page on Bucket Storage for more information. These two take precedence over all other AWS access methods.

ini files
S3_STORAGE_ACCESSKEY=$ACCESS_KEY
S3_STORAGE_SECRETKEY=$SECRET_KEY
S3_STORAGE_ENCRYPTION_KEY=$ENCRYPTION_SECRET

Also supported, are AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY. The third option here is to set the encryption key, which can be any UTF-8 string. The suggested value is 64 or more random ASCII characters.

You could instead point to your own hosting endpoint for the S3 to use for storage. To use a non-AWS endpoint with the S3_STORAGE_ENDPOINT_BASE, setting it to the URL (e.g., http://my-own-s3:8080).