My eInk tablet won’t sync annotations with the app despite successful Wi-Fi connection

I recently got a reMarkable 2 tablet for digital note-taking and love the feel of writing on it. The tablet connects to my home Wi-Fi network just fine, and I can browse the cloud library on the device without issues. However, when I try to sync my handwritten notes and annotations with the reMarkable companion app on my MacBook, the sync process either hangs indefinitely or fails with a vague "sync error" message.

I've already tried rebooting both devices, reinstalling the app, and making sure both the tablet and MacBook are on the same network. I also checked firewall and VPN settings on my laptop, but nothing seems to block the connection. The tablet’s storage isn’t full, and it shows the latest firmware version installed.

I’d like to get smooth, automatic syncing working so I can review and edit my notes on the bigger screen. Has anyone else run into this kind of issue with reMarkable or similar eInk devices? What steps helped you fix syncing problems between the tablet and desktop app? Am I missing some hidden setting or workaround to enable reliable syncing?