Community Tip - When posting, your subject should be specific and summarize your question. Here are some additional tips on asking a great question.
Is it possible to attach a file lets say pdf/docx/excel etc. with a source file in Integrity?
No, at least I am not aware of.
Why not just putting the attachment into Source as a regular file, and create a shared link if you want?
Alternatively, do you also use also W&D? What about attaching the file to an Item instead?
Shared link between two source file could be work..but I am not sure how exactly make it enable?