Practitioner reporting describes a newer format of follow-up requests in which applicants may be asked to present original documents.
There is no direct communication channel with UGE: the office does not accept email and does not hold in-person appointments for this purpose. Originals are instead submitted through official public registries. A registry official digitises the documents and forwards them electronically to the competent body — in this case UGE.
Verification of the original takes the form of a copia auténtica electrónica: a certified electronic copy made by the registering official. The same submission can be made through different registry offices, so the specific route may vary from one case to another.
These observations describe reported cases rather than a new published rule. Their practical takeaway is simple: when travelling to Spain, bring the originals of your key documents where possible, so that a registry verification does not depend on another international trip.