Short answer
Yes, through the "Other S3-Compatible" option. Enter the provider's S3 endpoint and region, your access keys, the bucket name and the public URL your files are served from.
Example endpoints:
- Wasabi:
https://s3.eu-central-1.wasabisys.com, regioneu-central-1 - Hetzner Object Storage:
https://fsn1.your-objectstorage.com, regionfsn1 - Scaleway:
https://s3.fr-par.scw.cloud, regionfr-par
Use the endpoint and region of the location where your bucket was created. See the S3-compatible providers guide for the full setup.