Check if a document exists in Appian

Certified Senior Developer

So I have an interface that has links to documents that have been uploaded. However, the documents don't exist until after they've gone through a process model (or rather they're a temp file that you can't reference at that time). What I'd like to do is disable those links if the documents haven't been put into the system yet, but I am not sure how to check to see if the document exists in the system yet or not. Is there a function or something that can test a doc id to see if it's valid or not?

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