The current way of adding attachments in a SalesForce node will be deprecated and also poses limitations since it is not fully supported in the SalesForce lightning experience.
It would be nice if we would be able to add ContentVersions. In turn, these could link to one (or several) parents using the DocumentLink. Initially, it would already be great if it links to only one parent using the ObjectID.
This functionality is described here:
Reference regarding Attachments being deprecated in SalesForce:
https://help.salesforce.com/articleView?id=000314087&type=1&mode=1