Request Access: According to mockups, there should be a request access popup.

[kcondon]

@mheppler @sekmiller @eaquigley
According to mockups there should be a request access popup.
https://iqssharvard.mybalsamiq.com/projects/filesallthings-enduser-dataverse42andbeyond/Dataset%20-%20Files%20-%20Restricted%20Selected

https://iqssharvard.mybalsamiq.com/projects/filesallthings-enduser-dataverse42andbeyond/Dataset%20-%20Files%20-%20Guestbook

and finally a message:
https://iqssharvard.mybalsamiq.com/projects/filesallthings-enduser-dataverse42andbeyond/Dataset%20-%20Files%20-%20Request%20Access

Although this mockup shows a combined guestbook TOU and is for multi select request access. The mockup for individual request access shows no popup:
https://iqssharvard.mybalsamiq.com/projects/filesallthings-enduser-dataverse42andbeyond/Dataset%20-%20Files%20-%20Restricted

[eaquigley]

Related to #1476