It would be great that lansweeper has the option to receive an email with attachments or a folder that when it detects the presence of a new document it imports the documents to the database. Once this document is in SQL, you can open any asset and assign that document. That by default in the list of the asset only appears documents that have not been allocated to any asset. This could help in attach documents in a simple manner in fewer steps using scan to email or scan to folder of any MFP Printer.
