1º_ Document mentioned or attached in a file. It is used more in Venezuela. Possibly it is a reduction of "refilada", by the cut of paper and by being a thread of the main document. 2º_ Inflection of the verb rielar . See verbs/riela .
Riela comes from the verb shimmering which means shine with glimmer. Is synonym of the verb rutilar and is used generally in poetry. Example: the metals rielan or rutilan under the Sun.
riela is incorrectly written and it should be written as "SHIMMERING." being its meaning: First or third person of the VERB " is shimmering " shine dimly. Cabrillear, rutilar.