You can use something like Nextcloud to run your own webDav server, if that's something you are okay with. I haven't tried this, but I believe you can then share out files using Nextcloud via a unique link. Actually, I know the sharing works, just not sure if it's easy to do with a Zotero back-up of PDFs.

The most valuable workflow is the one you have been using and happy with. I wouldn't wish a changed workflow on anyone in this state. I would only suggest another way for someone who is unhappy and already regularly changing. Stick with what works.