The ERES does not define any limitations regarding the formats of documents attached to the registration and files module. However, we must take into account that certain functionalities of the service, such as the authentic copy, electronic notification or the signature holder, are limited to documents in PDF format.

In relation to the weight of documents, using the functionality to attach documents from the ERES screens, although there is no specific weight limit defined, files that exceed 30MB in weight are not recommended.

In the file entry method attached to the records and files that the service's web services incorporate, documents that do not exceed 129MB can be attached.

Regarding the nomenclature of documents, it must always follow the following pattern, always in capital letters and avoiding spaces:

TYPE OF DOCUMENT + SPACE + BRIEF DESCRIPTION + SPACE + DATE (YYYYMMDD).