Renaming a hyperlink

[ebirch]

I posted this question under the general not realizing that this might be a
more appropriate place.

I have an existing network folder of documents that are associated with a
record on one of my tables.

These files are named after the primary key of the record they are
associated with.
I've been able to link to these files by adding a hyperlink field to my
tables, but In order to add new files the user has to manually rename the
file to the record's primary key and save it to the network drive.

I want to add a button to a form that takes the file from the users hard
drive,
renames it to the records primary key, and then saves the file to the network
folder.

Thanks in advance.