Can an imported document be replaced?

[Jylb14]

Hello,
As a teacher, I often use Openboard to display a document with answers, hiding them to reveal them gradually as the discussion progresses with my students.

When I want to modify my document, I have to re-import it into Openboard and recreate all the answer masks for each answer.
Is there a way to modify only the imported document while keeping the existing answer masks? This would save me a lot of time and tedious work.

Sincerely,