Does anyone have any free S3 providers working with Cryptomator?

[SailReal]

Backblaze and Scaleway should work. Special is that you need to give “Allow List All Bucket Names" scope permission. Regarding Backblaze maybe this helps:

Backblaze B2 Connection (Android)

While creating the bucket, it is the Bucket Unique Name (the name you specified, not the bucked ID). Just created a test account myself and what worked was: [Screenshot_20211110_084927] Access Key = keyID Secrect Key = applicationKey While creating the application key I enabled Allow List All Bucket Names