set source directory for org-attach

[gyro funch]

Hi,

I'm relatively new to org-mode.

I am tending to use org-attach quite a bit as part of my workflow.

Instead of having to navigate from default-directory to the source of
the attachment, it would be great if I could set a better default.

I am probably missing something obvious, but is there a way to set the
default source directory for attachments?

Any advice is greatly appreciated.

Thank you for your help.

-gyro