Modules & VBA :: Copying File To Specified Folder And Updating Records With New Location?

I'm currently working on a database to track and inventory documents in my organization similar to a library catalog, but with a digital archive as well. I'll need the ability to "attach" documents to records in the main inventory (though using links instead of storing it in the db) and have the documents live in a centrally accessible location on our shared server.

I will need to have this function work through a few different tables and in a few different iterations, but I'm trying to work on the simplest part first, which is attaching a thumbnail/preview of a given document to the record for that document.

I've got some VBA working well which opens the file picker and copies the file to a directory relative to the DB. It also creates a folder with each employee's ID number if it doesn't exist already (which it gets from the Windows log in) and adds "Copied_" to the front of the file.

Now I'm trying to get the VBA code to interact with the record. Presumably I need to tell the form button I'm using to launch the VBA code to pass the primary key of the record being displayed to VBA. Then, at the end of the VBA code I need to take that value and find the record again from VBA so I can update the MediaThumbnailLink in the original record.

Does this order of operations make sense? If so, how should I go about passing these values back and forth and writing the new link value?

Here's the VBA I'm using so far...

Code:
Option Compare Database
Public Sub GoCopyThumbnail()
Dim fDialog As FileDialog
Set fd = Application.FileDialog(msoFileDialogFilePicker)
Dim varFile As Variant
Dim LUser As String

[Code] ....