save_attachment method removes previously associated attachments

[thaddeusm]

I'm working on a feature to allow users to edit their comments (and attachments) from the frontend. I'm using save_attachment() to handle additional attachments when a user edits and updates their comments. However, this method seems to replace any attachments that were previously associated with the comment.

I have patched this method in my local environment so that it accepts an array of previously associated attachment ids. Then, I'm merging those with any newly uploaded attachments before the method calls assign_attachment().

If I'm overlooking a method that I could use instead, I would appreciate any advice. Otherwise, would it be possible to add this type of support to the plugin?