Web SDK Image.getFile('preview'): supported non-sensitive rejection diagnostics?

In a single controlled attempt with reported Web SDK version 1.104731.0, getById returned the expected Image item (type image). Board getInfo succeeded before and after the file call and matched the expected board. Image.getFile('preview') was invoked once and rejected after 3345 ms; no File was returned. Our privacy-preserving recorder retained only Error.name=Error and local classifier labels OTHER_TEXT/UNCLASSIFIED. Those labels are our own, not Miro error codes. The raw error message was not retained. The inspected public SDK source sends IMAGE_GET_BLOB for getFile and implements getDataUrl through getFile; this source inspection is not an independent attestation of the bytes executed in that attempt. We have not established the cause or verified effective scopes. Is there a supported Web SDK way to obtain a non-sensitive rejection code/category that distinguishes file permission, image conversion/delivery and lifecycle failures? Which documented file-specific preconditions should we check? No retry, alternate image API or account/scope change occurred within this attempt. No private board/item IDs, images, signed URLs or credentials are included here.