Law 39/2015:
Article 28. Documents provided by those interested in the administrative procedure .
"2. The interested parties are not obliged to provide documents that have been drawn up by any Administration, regardless of the fact that the presentation of the aforementioned documents is mandatory or optional in the procedure in question, provided that the interested party has expressed his consent for them to be consulted or request It is presumed that the consultation or obtaining is authorized by the interested parties unless the procedure states their express opposition or the applicable special law requires express consent.
3. Administrations must not require interested parties to present original documents, unless, exceptionally, the applicable regulations establish otherwise. Also, the public administrations do not require data or documents from the interested parties that are not required by the applicable regulations or that have been provided previously by the interested party to any Administration.
For these purposes, the interested party must indicate at what time and to which administrative body he presented the aforementioned documents, and the public administrations must request them electronically through their corporate networks or by consulting the data brokerage platforms or other electronic systems enabled for the purpose. It is presumed that this consultation is authorized by the interested parties unless the procedure states their express opposition or that the applicable special law requires express consent; in both cases, they must be informed in advance of their rights regarding the protection of personal data. Exceptionally, if the public administrations cannot obtain the aforementioned documents, they can ask the interested party again to provide them."