Hello, Isabela!
Welcome to the community!
I am afraid we don't have a native way to achieve this, but while we can't endorse third-party Power-Ups, there is one here that looks like it might fit the bill, though it does have a third-party cost associated: https://trello.com/power-ups/60bd32bfc2fcaf094b4a9d49/file-manager
I hope this helps, but please let me know how it goes and if there's anything else I can assist you with. Looking forward to hearing from you!
Kind regards,
Alisson
Trello team
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