You can take your scans and insert them into a container field which should be in a documents table that relates to the customer and/or quotes table.
Yes FileMaker can do it with some work.
I believe you need a plugin to scan directly into a Filemaker field.
Yes Comment is correct that some kind of third party solution will be needed for directly scanning into a container field.
Here is one method
If you are okay with scanning the docs first and then Inserting the docs manually into the container field then you wont need a plugin.