Credit to Reddit user randonaut for helping get this page established. The downloads mirror the collections outlined on the main UAP landing page. Do note that the content here is just what was already in possession of the National Archives and doesn't reflect transfers from other government agencies. This also doesn't seem to fully encompass the National Archive's records either, as I have been tagging UAP related records and have come across plenty that haven't been added to that collection. They do at least seem committed to updating these pages somewhat frequently.
I've also been reaching out the National Archives to confirm the status of the transfers mandated by the last NDAA. However, I've not gotten a hold of anyone yet that seems to have definitive information on the subject. Speaking with randonaut, I've at least got insight into the contact that set up the bulk download page and I've also reached out to additional departments there. One of my current goals is to see if the metadata spreadsheets from each agency can be shared to track who is complying and what is being transferred.