Bulk preview silently fails if more than 100 files are previewed at one time

[dylandepass]

In order for bulk preview to work with more than 100 files you must be both signed in and have the author role.

If you try and bulk preview more than 100 files anonymously, the bulk API returns a 401 but the sidekick does not show a toast notifying the user of the problem.

If you are signed in but don't have the author role than the admin API returns a 403 but the sidekick does not show a toast notifying the user of the problem.

If you are signed in and have the admin.role.author role. Bulk preview via the sidekick works as expected with more than 100 files.