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It was a pretty significant plotline in the Clone Wars and Rebels animated series. Both of which are as canonical as the movies, according to Lucas/Disney. So it's not hard to catch up on if you really care. Simple youtube search will bring up tons of clips. Although his appearance in Solo was basically just an Easter egg for fans familiar with those shows, similar to some stuff they showed on Yavin during Rogue One. Although it obviously may have greater relevance in future movies.
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