If you are trying to create an invoice and are unable to select the client from "Bill Invoice to" drop down, it might be because the client is 'Inactive' in Collaborati.
Thus, you will not be able to create any invoice for an 'Inactive' client.
A LEDES file upload will show the message: ERROR: Invoice cannot be submitted to inactive client.
Also, you will not be able to submit a "Ready To Submit" invoice. On clicking the 'Submit' button, below error message will appear:
Contact Collaborati Support at 'firstname.lastname@example.org' to confirm the next steps.