Has support for viewing documents offline been implemented yet for 1PW 8?

Thank you for the swift reply, 1P_Dave. The usefulness of that feature would largely depend on what you specifically mean with "an option in the 1Password for Mac app to force a download of all document items and file attachments":

If you mean a setting in the 1PW for Mac app that, when turned on, forces documents and file attachments to be downloaded to that device (and kept there) whenever they are added or changed, then yes, that would be super helpful. This would ensure that documents and file attachments are always locally available, just like they are in previous versions of 1PW and in many other password managers.

If you just mean a button or a menu command in the app to initiate a one-time download/sync of documents and file attachments, then this feature would be of limited value, because it would not be "set it and forget it". Instead, it would require you to do a lot of micromanaging to make sure your locally saved files are always up-to-date and it would be prone to you forgetting to do so. There is a reason why 1Password does not require you to manually initiate the download of new and changed passwords, secure notes, etc., and the same reason applies to attached documents, because they are just as important as the other pieces of information in your vault. That said, a manual "sync" would, of course, be better than no sync, provided that the downloaded files are actually kept on the device und not regularly purged.