I'm looking at the Pro version with a view to using it to copy files to AWS S3 Glacier Instant Retrieval (and maybe occasionally getting stuff back out again).
It looks like I should be able to create an upload rule to set the storage class on anything uploaded using Cloudberry Explorer, by setting an HTTP header called x-amz-storage-class to GLACIER_IR.
I've done this, but the results seem inconsistent - I copied a few small folders across, with mixed results. A folder of JPGs all have storage class 'Glacier Instant Retrieval'. Another folder of PHP files all ended up 'Standard Storage'. In a third containing two EXEs and an HTML file, the EXEs are Glacier, the HTML file standard.
Could you please let us know the sizes of the files you are uploading to your S3? Most likely they are bigger than minimal size that is allowed for glacier instant retrieval. S3 Glacier Instant Retrieval has a minimum billable object size of 128 KB.